The Future of European Defense

For thirty years after the Cold War, European defense was mostly a story of managed decline. Militaries shrank, budgets fell, and the assumption underneath it all was that large-scale war in Europe was over and American power would cover whatever gaps remained. Russia's full-scale invasion of Ukraine in February 2022 ended that era in a single morning, and the future of European defense is now being written in real time as the continent scrambles to undo three decades of disarmament faster than it built it up. The central question is no longer whether Europe will rearm, since it has already begun, but whether it can rearm fast enough, deeply enough, and coherently enough to defend itself, especially if American protection becomes less certain than Europe long assumed.

The wake-up call and the rearmament

Ukraine did to European defense thinking what few things could: it made a land war in Europe real again, and with it the possibility that NATO's eastern members could face the same threat Ukraine did. The response has been the largest shift in European defense posture since the Cold War. Germany announced a historic increase in defense spending and a special fund to rebuild its long-neglected military, a change so significant it got its own word, Zeitenwende, the turning point. Poland embarked on a massive rearmament, buying tanks, artillery, and aircraft on a scale that will make it one of NATO's most capable land forces. Finland and Sweden, long neutral, joined NATO, ending an era of non-alignment and adding real military capability and strategic depth to the alliance's northern flank. Across the continent, defense budgets rose, with more members meeting or approaching NATO's target of spending 2 percent of GDP on defense, a target most had ignored for years, and the debate has already moved past 2 percent toward higher figures as the scale of the need becomes clear. The frontline states, closest to Russia and most alarmed, are leading, spending well above the old target and pushing the whole alliance to take the threat seriously.

But rearmament is easier to announce than to achieve, and the gap between the money committed and the capability delivered is where the future of European defense will actually be decided. Money must become equipment, and equipment must become trained, ready, sustainable forces, a process that takes years and that runs into the hard reality of an industrial base hollowed out by decades of low demand. The European defense industry, sized for the small orders of the peace-dividend years, cannot quickly produce the quantities of ammunition, weapons, and equipment that rearmament and the support of Ukraine require, a constraint the war exposed brutally when Europe struggled to supply Ukraine with artillery ammunition at the rates the war consumed it. Expanding that industrial capacity, building the factories, forging lines, and workforce to produce weapons and especially ammunition at scale, is one of the central challenges of European rearmament, since the money and the will can outrun the industrial ability to deliver, and a rearmament that cannot produce the mass a major war requires is incomplete. The renewed emphasis on logistics, ammunition stockpiles, and industrial capacity, the unglamorous foundations of military power that the peace-dividend years neglected, reflects the recognition that European defense needs not just more capable forces but the depth to sustain them in a long war, which the war in Ukraine showed to be a real possibility.

The American question and strategic autonomy

Underneath the rearmament runs a deeper and more uncomfortable question: how much can Europe rely on the United States? European defense has for decades rested on American power, the US forces in Europe, the American nuclear umbrella, and the enabling capabilities, intelligence, airlift, logistics, command systems, that Europe largely lacks and that make its militaries effective. This dependence was tolerable as long as American commitment was certain, but doubts about the reliability and durability of that commitment, driven by American political shifts and the pull of American attention toward the Indo-Pacific and China, have forced Europe to confront the possibility that it might one day have to defend itself with less American help than it has always assumed. This is the heart of the debate over European strategic autonomy, the idea that Europe should develop the capability to act and defend itself independently of the United States, a debate that has run for years but that Ukraine and the American reliability question have made urgent. The case for strategic autonomy is that Europe cannot indefinitely stake its security on the reliability of an ally whose commitment may waver, so it must build the capabilities, the enabling functions, the industrial base, the political ability to act, that would let it defend itself if it had to. The case against is that European strategic autonomy is enormously expensive, slow, and difficult, that Europe cannot quickly replace the American capabilities it depends on, and that pursuing autonomy risks weakening NATO and American commitment by suggesting Europe is going its own way, so that the pursuit of independence could undermine the alliance that still provides most of Europe's security.

The realistic future probably lies between full dependence and full autonomy, with Europe building more of its own capability while remaining within NATO and reliant on the United States for the near and medium term, a hedge against American unreliability rather than a break from the alliance. Europe is unlikely to achieve genuine strategic autonomy soon, since the capabilities it lacks, the enabling functions, the industrial depth, the nuclear deterrent that only France and Britain possess in Europe, cannot be quickly built, so the American relationship will remain central to European security for the foreseeable future. But the direction is toward Europe doing more, spending more, producing more, and taking more responsibility for its own defense, driven by both the Russian threat and the American reliability question, a shift that is real even if full autonomy remains distant. The tension between building European capability and preserving the American alliance, between autonomy and dependence, will shape European defense for years, as Europe tries to become more capable of defending itself without breaking the alliance that still underpins its security.

The fragmentation problem

A distinctly European challenge complicates all of this: fragmentation. European defense is divided among many national militaries, national defense industries, and national procurement decisions, which produces enormous duplication and inefficiency, with European countries operating far more types of weapons systems than the United States, buying in small national batches rather than large common ones, and maintaining separate industries that could be more efficient if consolidated. This fragmentation wastes money, undermines the interoperability that lets forces work together, and prevents Europe from getting the full value of its considerable collective defense spending, so that Europe spends a great deal on defense but gets less capability than the money should buy, its resources dissipated across the duplication and inefficiency of fragmentation. Addressing this through more common procurement, more integrated industry, and more coordinated capability development is a long-standing goal that the rearmament has made more pressing, since rearming efficiently requires overcoming the fragmentation that wastes European defense spending, and initiatives to promote joint European procurement and industrial cooperation are part of the response. But fragmentation is rooted in national sovereignty, industries, and preferences that resist consolidation, so overcoming it is politically difficult, and the future of European defense depends significantly on whether Europe can become more integrated and efficient in how it develops, produces, and fields military capability, getting more defense from its spending by overcoming the fragmentation that has long dissipated it. The war and the rearmament have created both the pressure and the opportunity to address this, but whether Europe seizes it, achieving the integration and efficiency that would make its rearmament more effective, remains one of the open questions that will determine whether the future of European defense is a coherent, capable, and sustainable one, or a fragmented, inefficient, and incomplete effort that spends a great deal without achieving the security it seeks. The stakes are high, since the Russian threat is real, the American guarantee is less certain than it was, and Europe's ability to defend itself depends on turning its rearmament into the coherent, capable, sustainable defense that the new era demands, a transformation that is under way but far from assured.