Securing the Baltic: The Strategic Imperative for a Comprehensive Maritime Security Strategy​

Introduction: A New Era of Maritime Competition

The Baltic Sea, once considered a stable backwater of European security, has reemerged as one of the world’s most contested maritime spaces. Russia’s invasion of Ukraine fundamentally altered the security calculus for every nation bordering this semi-enclosed sea, transforming it from a zone of cooperation into a theater of strategic competition. The accession of Finland and Sweden to NATO has created an unprecedented situation: the Baltic Sea is now bordered almost entirely by Alliance members, with Russia maintaining only a narrow foothold through its Kaliningrad exclave and access via St. Petersburg and the Gulf of Finland.

This strategic transformation demands a comprehensive Baltic maritime security strategy—one that addresses the full spectrum of conventional and hybrid threats while positioning the region for sustained investment in defense capabilities, critical infrastructure protection, and economic resilience. The old paradigm of viewing the Baltic as merely a regional concern is obsolete. Today, securing the Baltic means securing Europe’s northern flank, protecting critical trade routes, and demonstrating the collective resolve of democratic nations against authoritarian aggression.

The Strategic Value of the Baltic Sea

Control of the Sea, Control of Trade

The fundamental principle of maritime strategy—that control of the sea equates to control of trade—applies with particular force to the Baltic. Approximately 15 percent of global shipping passes through the Baltic Sea annually, making it one of the world’s busiest maritime corridors. The ports of Hamburg, Gdańsk, Gothenburg, and St. Petersburg handle hundreds of millions of tons of cargo each year, connecting the industrial heartlands of Northern and Central Europe to global markets.

The Danish Straits—comprising the Øresund, the Great Belt, and the Little Belt—represent a critical chokepoint through which all Baltic maritime traffic must transit. Unlike the Turkish Straits, governed by the Montreux Convention, passage through the Danish Straits is governed primarily by customary international law and the 1857 Copenhagen Treaty, which abolished transit tolls. Whether these straits should remain open in times of crisis, or whether Denmark and NATO should possess the capability and legal framework to close them, has become an increasingly urgent question.

The Strait of Hormuz offers instructive lessons. Iran has repeatedly demonstrated that even the threat of closure or traffic interruption can be leveraged as a negotiating tool, forcing adversaries to weigh the economic consequences of escalation. Russia would almost certainly regard any attempt to restrict access through the Danish Straits as an act of war—but the inverse is equally true: Russia’s ability to threaten Baltic commerce represents a strategic vulnerability that NATO should address. A credible strategy should contemplate escalation scenarios, including the conditions under which traffic might be interrupted or restricted, moving beyond soft-law frameworks toward clear doctrines and capabilities.

Russian Vulnerabilities and the Gulf of Finland

Russia’s strategic position in the Baltic is paradoxically both threatening and vulnerable. St. Petersburg, Russia’s second-largest city and a major economic hub, sits at the eastern terminus of the Gulf of Finland. With Finland’s NATO accession, Russian naval assets must now transit a narrow corridor bordered entirely by Alliance territory to reach the open Baltic. This geographic reality places significant constraints on Russian power projection while simultaneously leaving Russian population centers and critical infrastructure unusually exposed to maritime threats.

The Kaliningrad exclave, home to Russia’s Baltic Fleet headquarters, is similarly isolated—separated from mainland Russia by Lithuania and Poland, dependent on transit rights, and vulnerable to blockade. Any comprehensive Baltic security strategy should account for these Russian vulnerabilities while remaining alert to the fact that Moscow will perceive efforts to exploit them as existential provocations requiring asymmetric responses.

Lessons from Ukraine: Adapting to Modern Warfare

The war in Ukraine has provided a brutal education in the character of modern conflict. The sinking of the Moskva, flagship of Russia’s Black Sea Fleet, by Ukrainian Neptune missiles demonstrated that even major surface combatants are vulnerable to determined adversaries employing relatively inexpensive anti-ship weapons. Ukraine’s successful campaign to contest the Black Sea using unmanned surface vessels, coastal defense systems, and creative tactics offers a template for Baltic defense.

Key lessons for Baltic security include the critical importance of anti-ship missile capabilities distributed along coastlines; the effectiveness of unmanned systems for reconnaissance, strike, and sea denial; the vulnerability of naval assets operating within range of land-based fires; and the necessity of robust air defense to protect maritime forces. The Baltic’s confined geography amplifies these dynamics—no point in the sea lies beyond the range of land-based systems deployed by littoral states.

The Hybrid Threat Spectrum

Subsea Infrastructure: Cables and Pipelines

The sabotage of the Nord Stream pipelines in September 2022 demonstrated the vulnerability of subsea infrastructure to deliberate attack. The Baltic seabed hosts a dense network of telecommunications cables, power interconnectors, and gas pipelines essential to regional economic integration and energy security. These assets represent attractive targets for adversaries seeking to inflict economic damage, sow confusion, or signal escalatory capability without crossing the threshold of armed conflict.

Recent incidents of suspected cable cutting in the Baltic have heightened concerns. The difficulty of attribution, the technical challenges of monitoring vast stretches of seabed, and the legal ambiguities surrounding responses to such attacks make subsea infrastructure protection a priority requiring dedicated resources, enhanced surveillance capabilities, and clearer doctrines for deterrence and response.

Electronic Warfare and GPS Jamming

GPS jamming and spoofing have become endemic in the Baltic region, with documented incidents affecting commercial aviation, maritime navigation, and emergency services across Finland, Estonia, Latvia, Lithuania, Poland, and Sweden. Russia has deployed sophisticated electronic warfare capabilities in Kaliningrad capable of disrupting satellite navigation across hundreds of kilometers.

These activities represent a persistent gray-zone threat that degrades the safety of civil navigation while testing NATO’s tolerance and response capabilities. Investment in resilient positioning, navigation, and timing (PNT) systems, including terrestrial backup networks, is an urgent requirement for Baltic security.

Cybersecurity Threats

The maritime domain is increasingly dependent on digital systems for navigation, cargo management, port operations, and vessel control. Cyberattacks targeting these systems could disrupt shipping, compromise vessel safety, or enable espionage. Baltic littoral states have experienced sustained cyber campaigns targeting government institutions, critical infrastructure, and private enterprises. A maritime security strategy should integrate robust cyber defenses, information-sharing mechanisms, and incident response capabilities across the region.

Russia’s Shadow Fleet and Sanctions Evasion

Russia has assembled a substantial “shadow fleet” of aging tankers operating under flags of convenience to evade Western sanctions on oil exports. These vessels, often lacking adequate insurance and safety certifications, transit the Baltic in significant numbers, originating from Russian ports including Primorsk and Ust-Luga. They represent not only a sanctions-enforcement challenge but also a serious environmental and safety hazard. A major oil spill from an inadequately maintained shadow fleet vessel in the confined waters of the Baltic would constitute an environmental catastrophe.

Enhanced monitoring, port state control measures, and coordinated interdiction policies are necessary to address this threat, balancing freedom-of-navigation principles against environmental protection and sanctions enforcement.

Sabotage and Critical Infrastructure Protection

Beyond subsea infrastructure, Baltic nations face sabotage threats to ports, energy facilities, transportation networks, and military installations. The proliferation of offshore wind farms, while essential for the energy transition, introduces new vulnerabilities—these installations are difficult to protect, represent concentrated investments, and could be targeted to disrupt power generation or undermine confidence in renewable energy development. Whether offshore wind farms ultimately constitute a threat to military operations, owing to radar interference and navigational constraints, or an opportunity for distributed energy resilience, requires careful analysis and integrated planning between defense and energy authorities.

Multi-Domain Operations: The Five Domains

Modern warfare operates across five domains: land, sea, air, space, and cyber. A comprehensive Baltic security strategy should integrate operations across all five, recognizing their interdependencies. Maritime operations depend on space-based assets for communications, navigation, and surveillance; cyber capabilities underpin command and control; air superiority enables surface fleet operations; and land-based systems—coastal defense missiles, air defenses, logistics hubs—are essential to projecting and sustaining maritime power.

The Baltic’s confined geography makes multi-domain integration both more critical and more achievable than in open-ocean environments. Land-based fires can reach any point in the sea; air operations can be supported from multiple national territories; and space and cyber capabilities can be coordinated across Alliance networks. The challenge lies in achieving seamless interoperability among diverse national systems and command structures.

Unmanned Systems and Technological Modernization

Unmanned systems—aerial, surface, and subsurface—are revolutionizing naval warfare. Ukraine’s innovative employment of unmanned surface vehicles against the Russian Black Sea Fleet demonstrates their potential for sea denial and strike operations at a fraction of the cost of traditional naval platforms. Baltic littoral states should prioritize investment in unmanned systems for surveillance, mine warfare, anti-submarine operations, and offensive strike, developing concepts of operation suited to the region’s unique geography.

The U.S. Role in Baltic Security: Lessons from the Arctic

The United States has significantly increased its engagement in the Arctic, recognizing the region’s growing strategic importance. A similar commitment to the Baltic is warranted. While European allies should bear primary responsibility for Baltic defense, American presence and investment serve as irreplaceable signals of Alliance commitment, enhance deterrence, and provide capabilities that complement European forces.

U.S. power projection to the Baltic region—through rotational deployments, exercises, prepositioning of equipment, and defense industrial cooperation—reinforces deterrence and provides capabilities, such as strategic airlift, advanced intelligence, surveillance, and reconnaissance (ISR), and submarine operations, that enhance the overall defense posture. The lesson from the Arctic is clear: American engagement catalyzes allied investment and demonstrates that the United States views regional security as integral to its own strategic interests.

Icebreakers and Arctic-Baltic Linkages

The northern Baltic, particularly the Gulf of Bothnia and Gulf of Finland, freezes during winter months, requiring icebreaker support for commercial shipping and potentially for military operations. Finland and Sweden possess substantial icebreaker fleets developed for commercial purposes, and the United States, which has invested in expanding its icebreaker fleet for Arctic operations, should continue to explore cooperation with Baltic allies on polar-capable vessel development and employment concepts.

Energy Security and the Polish Dimension

Energy dependence represents one of the Baltic region’s critical vulnerabilities. Poland has emerged as a leader in diversifying energy supplies, investing in LNG import terminals, the Baltic Pipe connecting Norwegian gas fields, and expanded interconnections with neighboring states. These investments reduce dependence on Russian energy while creating new infrastructure that itself requires protection.

Poland stands at the intersection of Baltic and Central European security, with significant stakes in both maritime defense and energy resilience. The country should consider updated national and maritime security strategies that reflect post-2022 realities, integrate with NATO planning, and position Poland as a leading contributor to regional defense. Warsaw’s investments in naval modernization, coastal defense, and air defense represent important steps.

Regional Cooperation: Learning from Nordic History

The Nordic countries have centuries of experience navigating great-power competition in Northern Europe. Denmark, Norway, and Iceland were founding NATO members; Finland and Sweden maintained armed neutrality throughout the Cold War while developing formidable defense capabilities. The tradition of Nordic defense cooperation—NORDEFCO, joint exercises, shared procurement—provides a foundation for expanded Baltic regional integration.

Historical lessons are instructive. The Baltic has been contested throughout recorded history—by Hanseatic traders, Teutonic Knights, and Swedish, Danish, Russian, and German empires. Control of the Baltic has repeatedly determined the fate of nations. The current moment suggests that democratic Baltic and Nordic states draw on this history while adapting to contemporary challenges: the speed of modern warfare, the pervasiveness of information operations, the integration of military and civilian systems, and the blurring of war and peace.

Strategic Approach: Chess and Boxing

Effective Baltic security strategy requires combining the patience and foresight of chess with the adaptability and resilience of boxing. Like chess, strategy demands anticipation of an adversary’s moves, positional advantage, and a willingness to sacrifice tactical gains for strategic objectives. Like boxing, it requires the ability to absorb punishment, adapt in real time, and maintain offensive capability under pressure.

Russia excels at the chess dimension—patient, long-term positioning, exploitation of ambiguity, calibrated escalation below thresholds that trigger a decisive response. NATO should develop comparable strategic patience while maintaining the boxing capability to respond decisively when required. The goal is not merely to deter major conflict but to prevail across the spectrum of competition—imposing costs on adversary gray-zone activities, protecting critical infrastructure, maintaining freedom of navigation, and demonstrating that aggression will not achieve its objectives.

Economic Costs and Investment Imperatives

The economic costs of Baltic insecurity are substantial and growing. GPS jamming disrupts aviation schedules, increases fuel consumption, and creates safety hazards. Cable damage interrupts communications and power flows. Shadow fleet operations depress legitimate tanker rates while creating environmental liabilities. The persistent threat environment raises insurance costs for Baltic shipping and deters investment in port infrastructure and offshore energy projects.

Conversely, a comprehensive security strategy creates investment opportunities. Enhanced surveillance requires sensors, platforms, and data-processing capabilities. Infrastructure protection demands hardening, redundancy, and rapid repair capacity. Naval modernization drives shipbuilding, weapons systems development, and technology innovation. The defense industrial base of the Baltic region—already significant in countries like Finland, Sweden, and Poland—can expand to meet these requirements while generating employment and technological advancement.

Conclusion: The Imperative for Action

The Baltic Sea stands at a strategic inflection point. The decisions made by Baltic and Nordic nations, by NATO collectively, and by the United States individually will shape the security environment for decades. A comprehensive maritime security strategy could be imperative.

Such a strategy could address the full spectrum of threats—conventional and hybrid, kinetic and non-kinetic, military and civilian. It should integrate operations across all five domains and balance deterrence with defense, prevention with response, and national capabilities with alliance coordination. And it should attract sustained investment in capabilities, infrastructure, and human capital. Most fundamentally, a Baltic maritime security strategy should communicate resolve. The time for such a strategy seems to be now.

Sean Pribyl is a partner at Holland & Knight LLP in Washington, D.C., where his law practice focuses on maritime, international trade, and national security matters. He previously served as a U.S. Coast Guard judge advocate (JAG) and as a U.S. Naval Reserve strategic sealift officer. He holds an M.A. in National Security and Strategic Studies from the U.S. Naval War College.