How the Ukraine War and Trump’s Return Are Dismantling the Transatlantic Alliance from Within

Driss EFFINA, PhD

Reading time: 13 minutes

Introduction: The Alliance That Survived Everything — Until Now

The North Atlantic Treaty Organization has survived the Korean War, the Suez Crisis, Vietnam, detente, the Soviet collapse, 9/11, Iraq, Afghanistan, and the financial crisis. For 77 years, it has been the foundational security architecture of the Western world — the institutional embodiment of the principle that an attack on one is an attack on all.

In 2026, for the first time in its history, NATO faces a crisis that cannot be resolved by a summit communiqué, a budget commitment, or a new rapid reaction force. It faces a crisis of political will — specifically, the will of its most powerful member to continue bearing the costs and accepting the constraints of collective defense.

I. Ukraine: The War That United and Divided NATO Simultaneously

1.1 The initial unity

Russia’s full-scale invasion of Ukraine in February 2022 produced a temporary but remarkable transatlantic unity. NATO members delivered over $200 billion in military and financial assistance to Ukraine. Germany reversed decades of defense passivity with its historic Zeitenwende declaration. Finland and Sweden abandoned generations of neutrality and joined the Alliance. For a brief moment, it appeared that Putin had achieved the opposite of his stated goal — a stronger, more united, more purposeful NATO.

1.2 The fractures beneath the surface

But beneath this unity, profound fractures were forming. Eastern flank members — Poland, the Baltic states, Romania — demanded a level of commitment that Western Europe was unwilling to match. Germany’s Zeitenwende proved more rhetorical than real, with defense spending targets repeatedly missed and weapons deliveries delayed. France pursued a parallel diplomatic track that irritated both Washington and Eastern Europe. Hungary consistently blocked or delayed Alliance decisions.

Most critically, the question of Ukraine’s NATO membership — the central issue that precipitated the war — was never resolved. The Vilnius and Washington summits produced formulas of deliberate ambiguity that satisfied no one and signaled to Moscow that the Alliance’s red lines were negotiable.

II. Trump’s Return: The Alliance’s Existential Stress Test

2.1 The 2% doctrine becomes a weapon

Donald Trump’s return to the presidency in January 2025 has transformed the NATO burden-sharing debate from an irritant into an existential question. Trump’s public statements questioning whether the U.S. would defend NATO members who do not meet the 2% GDP defense spending threshold have not merely emboldened Russia — they have fundamentally undermined the credibility of Article 5.

Deterrence depends entirely on credibility. If an adversary believes that an attack on Estonia might not trigger a full Alliance response — because the U.S. president has publicly conditioned that response on Estonian defense spending — then the deterrent effect of Article 5 is degraded, potentially to zero. This is not a theoretical concern. Baltic and Polish intelligence assessments in 2025 consistently rated Russian risk tolerance as elevated in direct proportion to perceived American commitment uncertainty.

2.2 The Ukraine negotiation: selling out or standing firm?

The most acute transatlantic tension has centered on the Trump administration’s approach to ending the Ukraine war. Washington’s pressure on Kyiv to negotiate — combined with signals that territorial concessions might be acceptable — has produced a crisis of confidence among European allies who fear they are watching a repeat of the 1938 Munich dynamic.

European leaders have responded with a combination of accelerated defense investment and desperate unity-signaling. The EU’s ReArm Europe initiative, the Franco-British nuclear cooperation discussions, and the German Bundeswehr expansion all reflect a European strategic calculation that the United States may no longer be a fully reliable security guarantor — and that Europe must begin developing autonomous defense capacity.

III. The Architecture of a Post-American NATO

3.1 European strategic autonomy: real or rhetorical?

The phrase ‘European strategic autonomy’ has been a fixture of French foreign policy vocabulary for decades. Under Macron, it became an explicit goal. The question in 2026 is whether it has any operational content.

The honest answer is: not yet, but more than before. Europe’s combined defense spending now exceeds Russia’s by a factor of four. The European defense industrial base is expanding. But Europe still lacks unified command structures, integrated logistics, and — most critically — nuclear deterrence independent of the United States. France’s nuclear arsenal is sovereign, but France has been reluctant to extend its deterrence umbrella to Eastern Europe in the way the U.S. extended it during the Cold War.

3.2 The Alliance’s three possible futures

NATO in 2026 faces three plausible trajectories:

• Managed adaptation: The Alliance absorbs Trump’s demands, Europeans increase spending to 2.5-3% of GDP, a Ukraine settlement freezes the conflict, and NATO survives in a modified form with reduced American forward presence but preserved collective defense commitments.
• Fragmentation: Trump’s second term produces an irreconcilable rupture — either a formal U.S. withdrawal from Article 5 commitments for non-spending members, or a European breakaway security structure that effectively bifurcates the Alliance.
• Renewal through crisis: The very severity of the threat galvanizes European political will in a way that decades of American pressure could not — producing a genuinely capable European defense architecture that strengthens rather than weakens the transatlantic relationship.

For the most comprehensive analysis of how Trump’s foreign policy doctrine is reshaping the transatlantic order, the book

The Biden Doctrine: Why America’s Global Strategy Faces Collapse — available at globalstrategyfiles.com — provides the essential strategic context for understanding how we arrived at this moment.

Conclusion

NATO is not dead. But it is undergoing the most profound transformation in its history. The comfortable assumption that American power would always backstop European security has been shattered — not by an external attack, but by internal political choices. The question for the next decade is not whether Europe will pay more for its defense. It will. The question is whether it will build the political institutions, the industrial capacity, and the strategic culture necessary to act coherently — before the window of American inattention produces an irreversible security failure.