The second presidency of Donald Trump has pushed the transatlantic alliance toward a moment of profound reassessment. While friction between the United States and its European allies is not new, the cumulative effect of recent political signals, policy choices, and rhetorical confrontations suggests that something more structural is underway. What was once a resilient partnership grounded in shared values and mutual trust is increasingly being reframed in transactional and strategic terms.

During Trump’s first term, tensions with Europe were often dismissed as turbulence within a fundamentally stable system. Leaders in Berlin, Paris, and London assumed that institutional inertia and shared interests would ultimately prevail. However, the second Trump administration has challenged that assumption more forcefully. European policymakers now confront a more unsettling possibility: that the divergence is not temporary, but indicative of a longer-term shift in United States foreign policy doctrine.

One of the clearest signals of this shift lies in the ideological posture of rising figures within the American political landscape. JD Vance, widely viewed as a potential successor within the Republican movement, has articulated a worldview that departs sharply from traditional Atlanticism. His remarks at the Munich Security Conference, where he argued that Europe’s primary threat stems from internal democratic erosion rather than external adversaries such as Russia, were met with alarm across the continent. For European leaders, such statements raise fundamental questions about Washington’s future strategic priorities.

The implications are not merely rhetorical. European governments are now actively planning for scenarios that would have seemed improbable a decade ago. These include the possibility of reduced United States security guarantees, increased economic coercion, and a more unilateral American approach to global governance. In response,........

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