Union of the Four Seas – a New Security Bloc in Response to Contemporary Global Threats

After the leadership change in the United States, the country’s policy on security issues in Europe underwent drastic changes. In particular, the states of Central and Eastern Europe—which traditionally relied on U.S. support within NATO—found themselves under threat. There are also a whole range of new challenges for countries bordering the Baltic and North Seas. In the context of a weakened North Atlantic Alliance without active involvement from official Washington, European countries are now compelled to establish their own security mechanisms.

Therefore, in our view, one of the most promising European security initiatives could be a new and genuinely effective supranational union, provisionally called the Union of the Four Seas (U4S)—a bloc of countries that have an increased need to protect their sovereignty and a shared objective of deterring Russia’s aggressive policies. This primarily military alliance, unlike NATO, can focus on specific challenges unique to the states that surround the Black, Adriatic, Baltic, and North Seas.

And, indeed, we realize that such a country format goes beyond the traditional framework of previous “Three Seas” initiatives—Baltic, Black, and Adriatic—but new and urgent security challenges oblige us to expand our notions of the geographical and political boundaries of potential military or politico-military supranational associations/organizations. Nonetheless, given the current geopolitical realities, the Scandinavian countries—namely Denmark, Norway, Sweden, and Finland—are, in our opinion, simply forced to urgently reassess their defense plans (or are already actively doing so—author’s note) and to join in creating a new security shield against Russia.

This joint initiative of states bordering the waters of the above-mentioned four seas should aim to bolster security and stability in Northern, Eastern, and Central Europe through shared military, energy, and economic coordination. The creation of the Union of the Four Seas would be a response to the need for European countries to take responsibility for their own security, as faith in traditional security guarantees has, for obvious reasons, weakened considerably, and official Washington has repeatedly stated that European security today is a matter for Europe itself.

The U4S concept is based on the idea of forming a new flexible coalition of states sharing common threats and interests. Unlike classic alliances such as NATO, this union envisions a rapid response to challenges, enhanced coordination in crisis situations, and more robust economic cooperation to ensure stability. The key message of this initiative is that the Union of the Four Seas is not in competition with NATO, but rather intended to supplement it. Its members will continue to interact with the Alliance, but at the same time will be able to promptly address regional challenges while strengthening their own defense capabilities.

Given the geographical positions of its potential member states, their experience in countering hybrid threats, and Ukraine’s significant military potential, U4S could become a central element of a new European security system. A common strategy would help bolster the region’s defense capabilities, ensure energy independence, and lay the groundwork for stable economic development. U4S is essentially an answer to new realities that should serve as the cornerstone of long-term security in Europe.

Despite the obvious advantages, the establishment of such a union would require:

• Setting up a joint military command structure;
• Integrating defense strategies and exchanging intelligence;
• Developing modern and effective mechanisms to deter Russia’s reckless behavior;
• Finding economic tools to maintain the bloc’s stability.

Historical Context and the Origins of the “Intermarium” Concept

The idea of creating such a regional alliance, particularly among the countries of Central and Eastern Europe, has deep historical roots. One of the first to propose a similar concept was Józef Piłsudski, a Polish political, military, and statesman who served as the first leader of newly reconstituted Poland after World War I. His “Intermarium” (Polish: Międzymorze) concept envisaged forming a federation of states situated between the Baltic, Black, and Adriatic Seas. This alliance was to serve as a buffer between Germany and the Soviet Union, which in the first half of the 20th century posed the greatest threats to the sovereignty of the region’s countries.

Despite its strategic merits, Piłsudski’s idea was not realized due to a number of factors: insurmountable divisions among potential members at the time, the negative influence of major powers (chiefly the victorious countries in World War I—author’s note), and domestic political problems within Poland itself.

Although Piłsudski’s concept was not implemented, several attempts subsequently took place in the region to form coalitions aimed at ensuring security and economic cooperation:

• The Three Seas Initiative – a modern cooperation format among countries located between the Baltic, Adriatic, and Black Seas. Its main goal has been to strengthen transport, energy, and digital infrastructure to reduce dependence on Russian energy resources and influence. Despite its economic focus, this initiative is strategically significant for regional security.
• The Visegrád Group (Poland, the Czech Republic, Slovakia, and Hungary) was created to facilitate European integration and ensure stability in Central Europe. Although it primarily focuses on internal European reforms, this alliance was also intended to play an important role in strengthening regional security.
• The Baltic Assembly (Estonia, Latvia, Lithuania) – a forum for parliamentary cooperation among the Baltic states that coordinates joint action in security, economy, and culture. Given Russia’s aggressive policies, this body has markedly stepped up its efforts in the security sphere.

The experience of previous initiatives shows that the success of such projects depends on several key factors:

• A shared perception of threats. Alliances in which countries hold differing priorities frequently lose effectiveness.
• Political will and readiness to compromise. Historical disputes can become a serious obstacle to coordination.
• Support from Western partners. Initiatives based on backing from the United States and the EU have been more successful in boosting security and developing infrastructure.

Hence, the concept of the Union of the Four Seas can build on the experience of earlier attempts at regional integration by uniting military, energy, and economic cooperation in a new security shield in Europe to counter Russia.

1. Geographical and Strategic Importance of Member States

To begin with, the Union of the Four Seas has a unique geopolitical location that offers both strong defense potential and strategic economic value. The nations that may join this bloc would form a kind of “protective belt” stretching from Northern Europe to the Balkans, creating a bulwark against Russian aggression while opening new paths for economic cooperation.

To better understand each country’s role, it makes sense to divide them into four strategic groups: the Northern, Central, Southern flanks, and the Adriatic region.

1.1. The Northern Flank – Defending Scandinavia and Northern Europe

Norway, Sweden, Finland, and Denmark control the strategically significant Northern region that is crucial for Arctic and Baltic Sea security.

• Norway is a NATO country with a strong navy, ensuring control over the North Sea and access to key Arctic routes.
• Sweden and Finland, having recently joined NATO, maintain modern armies and play a central role in deterring aggression on the Northern flank.
• Denmark controls the Skagerrak and Kattegat straits, which connect the North Sea and the Baltic Sea.

This group of countries can safeguard trade routes in Northern Europe and will play a vital part in creating a unified air defense system.

1.2. The Central Flank – Strategic Barrier Between Europe and Russia

Poland, Estonia, Latvia, and Lithuania make up a critical defensive belt on Europe’s eastern flank.

• Poland is the region’s largest military powerhouse, investing heavily in defense and army modernization.
• The Baltic states, though relatively small militarily, have a strategic location (particularly the Suwalki Gap) that is crucial for Europe’s overall security.

This area is the most vulnerable to potential hybrid threats from Russia and thus requires special attention in military cooperation.

1.3. The Southern Flank – Control over the Black Sea Region

Ukraine, Romania, Bulgaria, and Turkey form a crucial belt for oversight of the Black Sea.

• Ukraine is currently the only European state possessing unique military experience, advanced defensive technology, and a robust army, which has proven capable of effectively resisting Russian aggression.

Ukraine has also become not only a testing ground for modern military technologies but also a source of valuable expertise in contemporary warfare. Its combat innovations in drones, air defenses, artillery, and electronic warfare can be critical to enhancing the potential Union of the Four Seas.

In addition, Ukraine is a key part of the transportation infrastructure linking the Black Sea and the Baltic region, as well as an important supplier of agricultural products and energy resources.

• Romania and Bulgaria control the southwestern coast of the Black Sea and are vital to Balkan security.
• Turkey, by controlling the Bosphorus and Dardanelles straits, has a strategic influence over the entire Black Sea region.

This bloc should form the foundation of the Union of the Four Seas’ maritime security.

1.4. The Adriatic Region – Balkan Stability

Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, and Albania can and should ensure stability in the Balkans, which is critical for the security of Southeastern Europe.

• These countries host strategically important ports along the Adriatic coast.
• Geographically, they connect Central and Southeastern Europe.

Stability in this region can be achieved through close security cooperation.

1.5. Potential Partners – Widening Strategic Depth

Moldova, Serbia (after the change of its pro-Russian leadership—author’s note), and Georgia (a similar situation to Serbia—author’s note) can play an important role in forming a notional buffer zone between the Union of the Four Seas and Russia.

• Moldova, given its proximity to Transnistria, has strategic importance for the security of Ukraine and Romania.
• Serbia’s participation could bring greater stability to the Balkans.
• Georgia’s security cooperation with Ukraine and Turkey would help strengthen control over the equally significant Caucasus region.

Such a strategic subdivision will allow the Union of the Four Seas to effectively defend Europe’s eastern flank, ensure stability in the Balkans, and control key maritime routes. By combining Ukraine’s combat experience, Poland’s and Turkey’s military power, and the Nordic countries’ capabilities, this alliance could become not just a defensive bloc but also an important economic hub in Europe’s new security architecture.

2. The Military Component of the Potential Bloc

In order to guarantee effective security and to deter potential aggression, the U4S must be backed by a strong military pillar. Considering the threats from Russia and the complex geopolitical situation, the key elements of this bloc should include:

2.1. Ukraine’s Role as the Region’s Military Leader

Ukraine, with its unique combat experience gained from a protracted war against Russia, can play a central role in shaping the Union of the Four Seas’ military potential.

• Tactical expertise – The Ukrainian Army has demonstrated the effective use of modern artillery, drones, and electronic warfare technologies, significantly enhancing its combat capability.
• Defense industry innovations – Ukraine has developed a series of advanced projects, including strike drones, mobile air defense systems, and new types of anti-tank weapons.
• Training centers – Ukraine has already become a training ground for allied military units. This experience could be expanded within the framework of U4S.

2.2. Joint Rapid Reaction Forces

To provide an immediate response to threats, it makes sense to establish unified rapid reaction forces composed of units from various bloc member states.

• Ukrainian assault and airmobile units could form the core of these forces, reinforced by Polish, Romanian, and Scandinavian brigades.
• Turkey, as a powerful military state, could provide air support and oversee control of the Black Sea straits.
• The Baltic and Nordic countries could focus on maritime security in the Baltic and North Seas.

These forces should operate under a “360-degree defense” principle, addressing potential threats from land, sea, and air.

2.3. Integrating Air and Missile Defense Systems

The Union of the Four Seas region needs a unified, well-coordinated air and missile defense system.

• Ukraine has already gained experience in modernizing Soviet-era air defenses and integrating Western systems such as Patriot, IRIS-T, and NASAMS.
• Poland is expanding its air defense capabilities, procuring advanced missile systems.
• Turkey, possessing its own air defense developments, could be a pivotal element of this system on the southern flank.

Integrating air defense capabilities would create a shared “dome-like protective shield” over the Union’s territory.

2.4. Common Center for Intelligence Gathering and Analysis

Effective threat response calls for a single intelligence hub that consolidates information from:

• Space-based reconnaissance (satellite data from the EU and the U.S.);
• Signals/electronic intelligence (monitoring Russian troop movements);
• Cyber intelligence to counter information attacks.

Such integration would ensure a high level of coordination and rapid reaction to potential threats.

2.5. Joint Military Exercises

Regular exercises among U4S countries would enhance interoperability between armies, standardize command structures, and improve logistical capabilities.

• Ukraine could serve as the main training ground, allowing allies to gain experience in modern warfare.
• Special emphasis should be placed on practicing hybrid warfare scenarios, as states in the region have repeatedly faced cyber threats, information attacks, and sabotage activities.

The military dimension of the Union of the Four Seas should become one of its strongest advantages. Combining Ukraine’s experience, Poland’s military infrastructure, Turkey’s influence in the Black Sea region, and the technological prowess of the Nordic countries will enable the creation of a robust defensive bloc capable of deterring any threat from the East.

3. Economic Cooperation and Energy Security

The Union of the Four Seas not only offers military and political potential but also holds significant opportunities for economic development. Thanks to the strategic location of its member states, this bloc can become a new, powerful economic center in Europe. Key areas of economic cooperation will include developing transport infrastructure, achieving energy independence from Russia, and establishing new trade and economic ties.

3.1. Transport Corridors – The Basis of Economic Integration

Infrastructure integration among Union of the Four Seas states is critical to the bloc’s economic stability. Several key transport corridors could serve as the foundation for developing regional trade and logistics:

• Via Carpatia - a strategic route connecting the North Sea to the Black Sea via Poland, Slovakia, Hungary, Romania, and Bulgaria, will improve troop mobility and strengthen economic links among these countries.
• Rail Baltica – a high-speed rail project intended to link the Baltic states with Poland and Western Europe, will significantly accelerate cargo transport and increase the Baltic states’ integration into the European economic space.
• Black Sea–Baltic Transport Corridor – a logistical route connecting Ukraine’s ports of Odesa and Chornomorsk with Poland’s Gdansk and Gdynia.
• The Danube Transport Corridor – leveraging the Danube as a major waterway for cargo transport between Central and Southeastern Europe.

These routes will create a robust transportation network, thereby bolstering the Four Seas Union’s economic resilience.

3.2. Energy Security – Reducing Dependence on Russia

A key task for the Union of the Four Seas should be to weaken Russia’s energy influence on the region.

• Gas network interconnectors – expanding existing pipelines delivering gas from Norway, the U.S., and Qatar to Central and Eastern Europe. Poland and Lithuania are actively developing LNG terminals, which can form the basis for a shared Union energy policy.
• Baltic Pipe – a strategic pipeline delivering Norwegian gas via Denmark to Poland, providing an alternative to Russian gas.
• Southern Gas Corridor, routing Azerbaijani and Central Asian gas through Turkey to meet the energy needs of the Balkan region.
• Investments in nuclear energy – At a minimum, Poland, Romania, and Ukraine can and should actively expand their nuclear capacity as an alternative to Russian energy resources.
• Renewable energy – The region has strong potential in wind, solar, and hydro power. Northern Europe (Denmark, Sweden, Norway) and the Carpathians (Ukraine, Romania) are particularly promising.

3.3. Ports and Maritime Trade

Ports along the Baltic, Black, North, and Adriatic seas have the potential to become central trade hubs for the region.

• Gdansk (Poland), Gdynia (Poland), Klaipeda (Lithuania), Riga (Latvia), and Tallinn (Estonia) offer access to Northern Europe and Scandinavia.
• Odesa (Ukraine), Constanța (Romania), and Varna (Bulgaria) are essential for trade with the Middle East.
• Rijeka (Croatia), Koper (Slovenia), and Bar (Montenegro) could serve as gateways to Italy and other Mediterranean countries.

Developing modern port infrastructure will open up alternative trade routes, reducing dependency on Russian transport networks.

3.4. Advantages of Economic Integration

Economic coordination under the Union of the Four Seas would bring new opportunities to the region:

• Attracting investment in transport, energy, and defense infrastructure;
• Simplifying trade procedures among member states;
• Broadening the market for Ukrainian goods and technologies, particularly in defense;
• Strengthening cybersecurity and protecting critical infrastructure.

Thus, the Union of the Four Seas has unique prospects for economic integration, potentially creating a powerful economic belt in Central and Eastern Europe. Less reliance on Russian energy, improved transport routes, and expanded port infrastructure will not only boost each member’s security, but also ensure sustained economic growth.

4. Political Coordination and Diplomatic Strategy

Successful implementation of the security, economic, and social objectives of the Union of the Four Seas requires establishing an effective system of political coordination. In a world now more unstable than ever, with threats to the sovereignty of individual nations on the rise, the countries of this region need a united diplomatic platform for coordinating positions and protecting their interests on the international stage.

4.1. A Common Political Platform

Union of the Four Seas countries already have significant experience working together within the EU, NATO, and other international bodies. However, to ensure quick decision-making and coordination of their own policies, they need a separate platform that would:

• Coordinate foreign policy—developing a unified response to Russia’s aggressive actions, hybrid threats, or political pressure.
• Undertake shared diplomatic outreach—lobbying for the region’s interests in global organizations.
• Formulate a strategic agenda—advancing new economic, defense, and energy initiatives.

Establishing this platform would allow U4S states to act as a single entity on the world stage, thereby amplifying their influence in Europe and globally.

4.2. Establishing the Union of the Four Seas Council

To coordinate actions effectively, it makes sense to create a permanent body—the Union of the Four Seas Council—that would serve as a forum for decision-making in key areas.

• The Council’s members might include government representatives from each participating country at the ministerial level (foreign affairs, defense, economy).
• The meeting format could include regular summits of state leaders as well as a permanent expert working group for crisis response.
• The Council’s headquarters could be located in Warsaw (Poland), at the center of the region, which has a strong political and military infrastructure.

This body would facilitate swift alignment of political positions, coordinate joint projects, and respond to security threats.

4.3. Engagement with the EU and NATO

The Union of the Four Seas should not be seen as an alternative or competitor to the EU and NATO, but rather as a natural partner that complements existing structures.

• Cooperation with the EU would allow bloc members to obtain funding for infrastructure projects, energy independence, and defense modernization.
• Cooperation with NATO would promote joint defense initiatives, such as reinforcing the Alliance’s eastern flank, sharing intelligence, and holding joint exercises.
• The Union of the Four Seas could act as an intermediary platform for states aspiring to join the EU and NATO (notably Ukraine, Moldova, and Georgia) by helping them adapt to European standards.

4.4. Supporting Countries Seeking European Integration

One of the key goals of the Union of the Four Seas’ diplomatic strategy should be to support those countries on the path to European integration.

• Ukraine, which has shown resilience and military strength, may gain further political backing from the bloc regarding its accession to NATO and the EU.
• Moldova, vulnerable to political and economic pressure from Russia, needs strong support to safeguard its independence.
• Georgia, which has long expressed its desire to join Western structures, can draw on the experiences of other countries in the region to counter external threats (provided it changes its pro-Russian policy stance—author’s note).

The U4S can serve not only as a political tool but also as a practical mechanism for supporting these countries on their journey toward Euro-Atlantic integration.

4.5. Countering Russian Influence and Hybrid Threats

Union of the Four Seas states have repeatedly faced Russian information campaigns, cyberattacks, and economic pressure. To effectively fight these challenges, it is necessary to:

• Establish a Center for Countering Hybrid Threats, uniting experts from bloc countries to detect and neutralize Russian information operations.
• Develop cybersecurity mechanisms to share expertise on protecting state and military facilities in the digital realm.
• Set up a platform for tracking Russian economic manipulations, enabling timely detection of the Kremlin’s attempts to pressure bloc members via energy, trade, or financial levers.

Accordingly, political coordination and diplomatic strategy should form the foundation of the Union of the Four Seas’ success. A common decision-making platform, robust interaction with the EU and NATO, and proactive efforts to thwart Russian influence will provide stability, security, and international standing for the region.

5. Cultural-Educational Cooperation and Strengthening Social Bonds

To build a solid and stable Union of the Four Seas, it is necessary not only to develop military, economic, and political cooperation, but also to ensure close interaction at the societal level. The long history shared by many U4S states, along with their cultural ties and academic exchanges, can become a powerful tool for fostering trust among peoples of the region.

5.1. Joint Educational Programs and Student Exchanges

Union of the Four Seas members have strong research and educational capabilities. Integrating their educational systems can foster future leadership talent and increase the region’s competitiveness.

• Creating an academic mobility program, similar to Erasmus+, allowing students from bloc countries to study at leading partner universities.
• Sharing expertise in military education—Ukrainian military academies, which have garnered unique experience in modern warfare, could serve as key institutions for training officers from other bloc members.
• Conducting joint research projects in cybersecurity, biotechnology, defense technology, and energy will drive regional progress.

5.2. Supporting Cultural Projects

Cultural exchanges play a critical role in forging strong societal bonds. Through art, literature, film, and music, we can shape a positive image of the Union of the Four Seas and encourage cultural interaction.

• Festivals and art events showcasing the cultural heritage of the bloc’s various nations will enhance mutual understanding and appreciation among their societies.
• Collaborative film projects reflecting the region’s history and present challenges can be an effective means of cultural diplomacy.
• Uniting national cultural institutes under a dedicated Union of the Four Seas program would facilitate the coordination of cultural initiatives on the international stage.

5.3. A Shared Historical Heritage as the Basis for Regional Identity

Union of the Four Seas nations share a common historical experience, particularly in their struggles for independence from imperial powers (Russian, Austro-Hungarian, and Ottoman), as well as their resistance to totalitarian regimes in the 20th century (Nazi Germany, Fascist Italy, and the Communist USSR).

• Historical research and archival projects will help restore an accurate history of the region and counteract Russian propaganda.
• Joint memorial projects to honor the victims of Soviet repressions, genocides, and wars will be an integral part of forming a collective historical memory.
• Establishing a large-scale Museum of the History of the Union of the Four Seas could be a symbolic step in shaping regional identity.

5.4. Joint Media Projects to Combat Disinformation

Information warfare is one of the main threats to countries in the region posed by Russia. As is well known, the Kremlin actively spreads fake news and narratives designed to destabilize societies in Eastern and Central Europe.

• Creating an independent Union of the Four Seas news agency would facilitate timely refutations of Russian disinformation and the dissemination of accurate information.
• Bringing together national TV channels and media resources in a regional media platform would help counter hostile propaganda.
• Media literacy programs for youth and the elderly would reduce the impact of disinformation.

5.5. Supporting Civil Society and Strengthening Democratic Values

Civil society organizations, volunteer movements, and activists play a crucial part in safeguarding democratic processes and social resilience in the region.

• Joint civil society forums would help activists and thought leaders share experiences across the bloc.
• Funding independent media and human rights organizations would bolster democratic institutions in member countries.
• Training programs on human rights and civic engagement would foster responsible, well-informed citizens.

Cultural and educational cooperation is key to the successful integration of Union of the Four Seas states. Joint educational and cultural initiatives will contribute to forging a common identity, strengthening democratic values, and enhancing societal resilience against external threats.

6. 6. Potential Challenges

Although the Union of the Four Seas has considerable potential to fortify regional security and economic stability, there are several challenges that may hamper its implementation.

6.1. Resistance from Russia and Emerging Hybrid Threats

First and foremost, it is important to emphasize that Russia will certainly view the Union of the Four Seas as a threat to its geopolitical interests and will seek to undermine its stability at any cost. The main forms of hybrid influence may include:

• Disinformation campaigns aimed at discrediting the Union in the eyes of the international community;
• Backing pro-Russian political forces in member countries to foment domestic conflict;
• Intimidation, threats, bribery, and other more drastic methods targeting political and civic “actors”;
• Attacks on critical infrastructure, notably in the military-industrial, energy, and communications sectors.

6.2. Internal Disagreements Among Member States

Differences in economic development, political ambitions, and historical conflicts can create friction among U4S members. Overcoming these differences requires:

• Conducting regular consultations to build consensus on key security issues;
• Establishing an arbitration mechanism for swift conflict resolution;
• Maintaining internal dialogue on coordinating economic and military priorities.

6.3. Risks of Economic Dependence

Greater economic integration between the Union of the Four Seas and Western countries also carries certain risks of dependence on large economies. To avoid this:

• Develop internal markets for energy resources and technology;
• Maintain independent financial policies that account for the interests of all member states;
• Create a common fund for financing strategic infrastructure projects.

6.4. Need for Coordination with NATO

Because the Union of the Four Seas would act as a complement to NATO, it is essential to prevent conflicts of interest between these structures. To achieve this:

• Align security initiatives with NATO leadership on a regular basis;
• Maintain open dialogue regarding the division of responsibilities in the region;
• Involve NATO military experts in joint exercises and consultations.

Overcoming these challenges will require clear coordination, diplomatic flexibility, and consolidated support among member states, making the Union of the Four Seas both effective and viable.

For a more comprehensive understanding of the Union of the Four Seas’ potential, it is also necessary to explore several additional aspects:

1. The Northern Flank (Norway, Sweden, Finland, Denmark)
   • The Arctic’s role in future conflicts (with Russia’s growing activity in the region);
   • Air and missile defense infrastructure in Scandinavia and its potential integration with Central Europe’s systems;
   • Naval cooperation in the North Sea.
2. The Central Flank (Poland, Baltic States)
   • A deeper look at the Suwalki Gap, a narrow strip between Poland and Lithuania that is pivotal for the security of the entire region;
   • Emphasizing Poland’s role as the main military and logistical hub for Ukraine and the Baltic countries.
3. The Southern Flank (Ukraine, Romania, Bulgaria, Turkey)
   • A more in-depth analysis of the Turkish Straits (Bosphorus and Dardanelles) and their significance for the Black Sea region;
   • Ukraine’s military innovations, such as drones, artillery systems, and anti-ship missiles.
4. The Adriatic Region (Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania)
   • Highlighting the role of ports along the Adriatic coast as significant transport nodes;
   • Security concerns in the Balkans, particularly the pronounced pro-Russian Serbian factor and its impact on regional stability.
5. Potential Partners (Moldova, Serbia, Georgia)
   • A deeper analysis of the risks and benefits of including Serbia, given its ties to Russia;
   • Underscoring Moldova’s strategic relevance as a buffer between Romania and Ukraine;
   • Post–pro-Russian Georgia’s role as a potential corridor for energy and military routes through the Caucasus.

In conclusion, the Union of the Four Seas could very well be a realistic and necessary response to the modern security challenges Europe faces following a weakened NATO and Russia’s increasingly aggressive policies. This union can serve as an effective supplement to existing Euro-Atlantic structures, bringing together countries with shared interests in safeguarding sovereignty, economic stability, and democratic values. Unlike earlier regional initiatives, the Union of the Four Seas has clearly defined goals that integrate military, energy, and political dimensions.

Ukraine can and should play a key role in this union, thanks to its unique military experience, advanced defense technologies, and strategic geographic location. Indeed, Ukraine’s contribution could become a catalyst for strengthening the security of the entire region, granting the bloc a formidable defense capacity. Ukraine’s experience in confronting contemporary threats—such as hybrid warfare, cyberattacks, and information operations—will be an immensely valuable asset for all member states.

Beyond the military component, the Union of the Four Seas can play a decisive role in achieving energy independence from Russia. Joint investments in LNG terminals, development of renewable energy sources, and infrastructural enhancements will significantly boost the region’s energy resilience. Another key area of collaboration involves the digital economy, which will help member nations keep pace with advanced technological challenges and ensure economic growth.

European countries now face the imperative of taking on greater responsibility for their own security. The Union of the Four Seas offers a practical avenue for doing so by harnessing the resources, expertise, and potential of the region’s nations. Politicians and the public at large would be wise to recognize the simple truth that only collective efforts can guarantee stability and sovereignty in Eastern Europe, thereby creating a new level of security on the continent.

Establishing such a bloc will not only reduce Russia’s influence in the region but also demonstrate that the countries whose shores are washed by the waters of the North, Baltic, Black, and Adriatic Seas can act as a powerful independent force, ready to defend their interests in today’s rapidly changing world.

 Author: Yurii Kopynets, PhD