The North Atlantic Treaty Organization (NATO) is facing a crisis of strategic identity and functional redefinition, with implications for its military and operational capabilities, the cohesion of its members, and its role. The Alliance, founded in 1949 with the signing of the Washington Treaty by 12 states, drew its original legitimacy from a deterrence logic directed at the Soviet Union. Today, however, NATO finds itself under mounting strain as growing divergences within the transatlantic alliance, compounded by longstanding U.S. demands for greater European burden sharing, overlapping crises across multiple regions that have exposed differences in American and European strategic priorities, and Washington’s gradual pivot toward the Indo-Pacific, increasingly reshape the Alliance’s internal dynamics and long-term trajectory.    

The Limits of European Autonomy  

The Russia Ukraine war reactivated the Alliance’s classical military function. Eight NATO members invoked Article 4 of the Washington Treaty in February 2022, triggering consultations, and the Alliance launched a deterrence-focused military operation encompassing thousands of troops along Europe’s eastern flank. This response arguably reasserted NATO’s role as Europe’s principal military alliance. By March 2022, NATO’s forward battlegroups on the eastern flank doubled from 4 to 8, extending the Alliance’s military presence from the Baltic Sea to the Black Sea. All NATO allies now exceed the 2% GDP defense spending target, the first time this has happened in recorded NATO history. This increase was largely driven by sustained U.S. pressure on European partners and repeated calls from Washington for greater burden-sharing and increased European investment in the alliance’s collective defense capabilities.  

In practice, however, NATO’s ‘revival’ reinforced Europe’s structural dependence on the United States (U.S.), as the Russia-Ukraine war exposed persistent gaps in European defense capacity, with some of the most decisive capabilities remaining American in origin and operation. 

By January 2025, the U.S. had provided Ukraine with $66.5 billion in security assistance since the onset of the war in 2022, including HIMARS systems, Patriot air and missile defense, Javelin anti-armor capacity systems,  satellite communications, and  commercial satellite imagery. These capabilities came largely from U.S. stockpiles or U.S.-based commercial infrastructure and were significant in shaping the tactical outcomes of the war. This level of commitment has been a central point of U.S. frustration with NATO, reflecting a long-standing American grievance that European allies do not bear sufficient responsibility for their own defense. For comparison, the European Union (EU) and its member states collectively provided €69.3 billion (about $75 billion) in military assistance to Ukraine by December 2025. The munitions-production crisis, in which the EU committed one million artillery shells to Ukraine in March 2023 but failed to meet its own March 2024 deadline, finally delivering them eight months late in November 2024, exposed the fragility of the European defense industrial base and the gap between its autonomy ambitions and its current defense-industrial and operational capacity. 

Beyond the Atlantic: Challenges in the Middle East 

Consecutive conflicts in the Middle East since October 2023, including the war on Gaza and the 2026 U.S.-Israel-Iran War, further exposed NATO’s structural limitations in determining when and how to respond to crises affecting transatlantic security. European economies have faced multiple threats to their energy security and supply chains: recurring tensions around the Strait of Hormuz, through which approximately 20% of global petroleum liquids pass daily, were compounded by Houthi attacks on Red Sea navigation that significantly reduced Suez Canal traffic, with transits remaining approximately 60% below pre-attack levels as of early 2026, disrupting trade flows between Asia and Europe.  

Yet, when Washington launched Operation Prosperity Guardian in December 2023 to secure Red Sea navigation, France, Spain, and Italy, three major European NATO members, declined to join the operation under U.S. command. The European Union subsequently launched a parallel mission, EUNAVFOR Aspides, in February 2024, which operates under a defensive mandate and is tasked with protecting commercial shipping and safeguarding freedom of navigation in the Red Sea. This division reflected deeper disagreements over burden-sharing, command authority, and the appropriate framework for responding to shared threats beyond the Atlantic. It also revealed a significant gap between Europe’s narrow security geography and the wider economic geography upon which European prosperity depends. 

U.S. Pivot East and Changing Security Priorities  

The transatlantic relationship is undergoing a structural transformation driven by Washington’s shifting priorities. Beginning with the Obama administration’s ‘Pivot to Asia’ in 2011, through Biden’s 2022 Indo-Pacific Strategy, Washington has increasingly prioritized its strategic competition with China, which in turn has resulted in greater expectations for European members to bear responsibility for their own security.  

In line with its pivot East, Washington has increasingly established parallel minilaterals such as AUKUS (2021) comprising Australia, the United Kingdom, and the U.S., and the Quad, comprising the U.S., India, Japan, and Australia. These efforts demonstrate that Washington is diversifying its strategic architecture beyond the NATO framework and is building Indo-Pacific coalitions that establish a wider and more coordinated U.S. presence with its allies. 

A substantive shift in the American approach to NATO has been observed since the first Trump administration when Trump threatened to withdraw from the Alliance in 2018 over European allies’ failure to meet defense spending commitments, and intensified in his second term with demands that allied defense-spending be raised to 5% of GDP. European allies were divided over the demands, with several members, including Spain, Belgium, and Italy, resisting the target. Despite this opposition, the Alliance agreed to commit 5% of GDP annually on spending by 2035 during the 2025 NATO Summit in The Hague, with 3.5% committed to core defense and 1.5% to broader defense- and security-related spending. Spain reportedly secured a partial exemption.  

Tensions escalated further in April 2026, when European allies refused to support U.S. military operations against Iran, prompting Trump to describe NATO as a ‘paper tiger’ and declare that U.S. withdrawal was ‘beyond reconsideration.’ Deepening fractures between Washington and Europe therefore risk reshaping the foundations of NATO, with far-reaching consequences for collective defense and the long-term durability of NATO as a unified security actor. 

The Limits of Collective Action 

In recent years, the Alliance has also increasingly struggled to translate power into decisive political action. Despite the clarity of the Russian threat after February 2022, large-scale military assistance to Ukraine unfolded mainly through bilateral channels, U.S.-led coordination mechanisms, and EU instruments rather than through NATO itself. NATO also ended its nearly 20-year mission in Afghanistan in 2021 without achieving durable stability, and member states struggled to coordinate the evacuation that followed. Most recently, when Iran struck Qatari LNG facilities in March 2026, cutting 17% of Qatar’s export capacity, NATO held discussions with Gulf partners, but produced no unified military response. These instances reveal the limits of NATO’s capacity to generate collective action.

Hybrid Warfare  

Recent conflicts have combined conventional and hybrid methods of warfare, exposing new vulnerabilities in global supply chains and energy markets. These include Iran’s disruption of shipping through the Strait of Hormuz, Moscow’s gas supply cut-offs during the winter of 2022-2023, and Iran’s attacks on Gulf energy infrastructure.  

This hybrid character extends to cyber warfare, such as the 2017 NotPetya attacks that cost the global economy more than $10 billion, and the strategic use of non-state actors, such as Iran’s deployment of the Houthis in the Red Sea and Hezbollah in Lebanon. These hybrid threats pose a challenge for NATO, as the Alliance was primarily designed to deter conventional interstate conflict.  

While the Alliance has attempted to adapt through the Strategic Communications Centre of Excellence in Riga and the Hybrid Centre of Excellence in Helsinki, these institutional responses remain fragmented and have yet to produce a fully integrated approach to hybrid threats. In this sense, NATO’s inability to develop a unified response to hybrid threats reflects, and reinforces, the broader crisis of coherence that characterizes the Alliance as a whole. 

Trajectories for the Alliance’s Future 

The Alliance’s future will likely depend on three competing trajectories, whose interaction will shape the architecture of international security over the coming decade.  

The first trajectory is NATO’s ability to transform into a global security framework addressing an interconnected threat network extending from Eastern Europe to the Arabian Gulf to the Indo-Pacific. This will rely on NATO’s ability to expand its cooperation with allies beyond the Atlantic, such as through deepened cooperation with its Indo-Pacific partners, the “IP4” (Japan, South Korea, Australia, and New Zealand), which have attended NATO summits since 2022. This is an ambitious path requiring a level of political and strategic integration that has proven difficult for the Alliance to sustain even within its own geographic scope, and demanding a substantive restructuring of its doctrine, tools, and partnerships. 

The second trajectory is a European recentering in which NATO returns to its original function as a continental European defense force while Washington independently manages its Indo-Pacific priorities through parallel coalitions. This path is more realistic, but it represents a deliberate strategic bargain between Washington and its European allies and requires leaders on both sides of the Atlantic to openly accept a diminished transatlantic security architecture.  

The third trajectory is characterized by the absence of strategic choice and is arguably the most consistent with current trends. It is the continuation of NATO as a formally strong but functionally fragmented framework. In this trajectory, NATO operates through shifting, situational coalitions within its structure rather than a unified strategy. The rise of smaller cooperative formats, such as the Northern Group, France’s European Intervention Initiative, and the British-led Joint Expeditionary Force, points toward this trajectory. Here, NATO retains its institutional prestige but gradually loses its capacity to produce decisive collective action. 

A Crisis of Functional Redefinition, Not Collapse 

NATO largely retains its military power, political legitimacy, and procedural cohesion. Its crisis is therefore not one of collapse, but of functional redefinition: it lacks a clear consensus on how, when, and where this power should be used. It benefited, historically, from a single, geographically bounded adversary, and a shared understanding of when Article 5 might be invoked. As threats expand geographically and become more diverse, it becomes harder to sustain a shared strategic vision among its 32 members. For instance, Turkey, a member since 1952 with the second-largest army in NATO, purchased Russia’s S-400 system in 2019 and, at one point, obstructed Sweden’s accession, illustrating how national priorities can diverge even among longstanding allies. 

Conclusion 

From the simultaneous wars in Ukraine and the Middle East to growing strategic competition with China and the rapid transformations in military technology, NATO today faces a multi-centered, multi-layered strategic environment that tests whether the Alliance can deter effectively while sustaining a shared political purpose beyond its military arrangements. Historical alliances rarely collapse through military defeat; they erode through the loss of shared purpose and the decay of internal trust among members. 

The real dilemma, therefore, no longer lies in NATO’s strength, but in whether the Alliance remains capable of defining itself in a fundamentally altered security environment. Either NATO adapts to integrate economic and technological security alongside traditional defense, or it risks becoming a hollow framework, retaining prestige while losing operational relevance.