When Donald Trump was re‑elected, American foreign policy appeared ready to move in a direction that left Europeans feeling exposed. For decades, Europe had been able to spend less on defense because the United States spent more. It was an arrangement that had held since 1945, and it worked—until it didn’t. Even during Trump’s first term, it became clear that the old bargain was fraying. If Washington was no longer willing to spend American money and American lives on distant conflicts, Europe would have to rethink its own security.
Europeans treaded lightly. The Trump administration treated “allies” with a firmness it rarely applied to “adversaries,” and its sympathy toward Vladimir Putin was difficult to ignore. Yet Europe was not prepared to defend itself. It was a delicate dance: avoiding open rupture with the United States while recognizing that the United States was no longer a fully reliable partner. The body language on both sides of the Atlantic began to change.
Meanwhile, Ukraine learned to survive without full‑throated American support and has begun taking the fight back to Russia. Iran, playing what once looked like a weak hand, has used geography, endurance, and the Strait of Hormuz to extract leverage that few thought possible. The global landscape has shifted in ways that would have seemed improbable only a few years ago.
And yet, paradoxically, Europe now finds itself in a stronger position than it was a year ago. Russia is more occupied than ever. A defeat in Ukraine would cripple Moscow’s ability to menace its other borders—not only because its resources are depleted, but because Ukraine’s defense has shown others what is possible. Twenty‑first‑century warfare may not belong to the largest armies, but to the most adaptive ones.
Europe benefits from this. Its most persistent geopolitical rival is consumed by a grinding war. And its forced independence from the United States has given it something it long lacked: the political will to spend what it believes it needs on defense. If a Trump administration recommends a certain level of spending, Europe may no longer feel obliged to listen. It is no longer wholly dependent on American protection.
This is the beginning of what European leaders like to call strategic autonomy—the ability to act without waiting for Washington’s permission or protection. It is not a declaration of independence so much as a recognition of adulthood. Europe is discovering that it must build its own capacity, set its own priorities, and prepare for conflicts that may not align with American interests. And in doing so, it is learning that autonomy is not merely a military concept but a political one: the freedom to decide what matters, and how much one is willing to pay for it.
More importantly, Europe is beginning to understand that modern conflict requires more than traditional defense budgets. It requires rethinking defense itself—technology, resilience, cyber capabilities, and the ability to respond to threats that do not look like the armies of the past.
The irony is that American unpredictability may have done what decades of diplomacy could not: it pushed Europe toward strategic adulthood.