NATO allies left Ankara reassured by public unity and Article 5 language, but European deterrence still depends on a US force-posture review that could reshape troops, logistics and command capacity on the continent.
NATO’s Ankara summit ended with allies publicly reassured by renewed Article 5 language and a large package of Ukraine and defence commitments. Yet one of the most important questions for European security remains unresolved: what will the United States do with its force posture in Europe?
Summit declarations matter, but deterrence is built from troops, logistics, bases, intelligence, command structures, airlift, air defence and reinforcement plans. If a Pentagon review leads to a significant change in US troop levels or support functions in Europe, the practical effect could be larger than the wording of any communiqué.
NATO’s own explanation of collective defence and Article 5 makes clear that the Alliance rests on the principle that an attack against one is an attack against all. But the credibility of that principle depends on the forces and plans behind it.
Unity and uncertainty
The Ankara summit succeeded in avoiding the most damaging public rupture. Allies heard language that supported NATO’s collective defence obligations. European leaders also accepted heavier spending expectations and larger responsibility for Ukraine support.
But reassurance is not the same as certainty. European governments still have to plan around the possibility that Washington may reduce, reconfigure or condition parts of its military presence in Europe.
That uncertainty matters because US forces provide more than combat troops. They provide enablers that European armies often lack at scale: strategic lift, intelligence, surveillance, reconnaissance, missile defence, command-and-control systems and high-end logistics.
Europe’s dependency problem
Europe has increased defence spending, but its dependency on US capabilities remains deep. Even if European governments meet higher spending targets, building replacement capacity will take years.
Defence Matters has covered the gap between NATO spending pledges and military output, while EU Global has followed the broader political pressure on Europe to assume more responsibility. The post-Ankara question is whether Europe can plan for greater autonomy before US posture changes force the issue.
If Washington maintains its current presence, Europe gains time. If the review produces reductions, European governments may face a faster transition than their defence industries and armed forces can handle.
The eastern flank
The uncertainty is most sensitive on the eastern flank. Poland, the Baltic states, Romania and other front-line allies rely not only on their own forces and European rotations, but on US presence as a signal to Moscow.
A change in US posture does not automatically mean weaker deterrence. Forces can be reconfigured, made more mobile or reinforced by pre-positioned equipment. But the political signal matters. Moscow will read any reduction through the lens of Western resolve.
That is why NATO’s public unity must be matched by practical planning. European allies need to know what assumptions to make about US troops, air defence, logistics and command support over the next several years.
Ukraine and force posture
Ukraine adds another layer. NATO‘s Ankara declaration and support commitments depend on sustained assistance, training and logistics. If US forces in Europe are reduced or reorganised, the support architecture for Ukraine may also be affected.
European allies and Canada are expected to finance more of Ukraine’s security assistance. But financing is only one part of the system. Transport, maintenance, training and intelligence coordination remain essential.
If the United States changes its footprint, Europe will need to fill not only budget gaps but operational gaps.
A summit aftertaste
The Ankara summit may be remembered as a moment when NATO avoided political fracture. But avoiding fracture is not the same as resolving strategic dependency.
The Alliance now faces a dual task: implement higher European spending and prepare for possible US posture change. That means accelerating European enablers, stockpiles, command capacity and industrial output.
Public unity bought time. It did not remove uncertainty.
For Europe, the lesson is blunt: Article 5 language matters, but force posture makes it credible. Until the US review is resolved, NATO’s Ankara reassurance will remain incomplete.
