The funding gap, estimated at several billion dollars for the current fiscal year, is now sending shockwaves through NATO headquarters in Brussels, where allied defense ministers are quietly recalculating their own spending plans.
The shortfall stems from a combination of rising operational costs, unanticipated inflation in defense contracts, and the Biden administration’s continued support for Ukraine, which has consumed a larger share of the Pentagon’s discretionary budget than initially projected. Senior defense officials have acknowledged that the gap could force the U.S. military to scale back troop rotations and equipment prepositioning in Europe, two pillars of the alliance’s deterrence posture against Russia.
European allies, who have spent the past two years increasing their own defense budgets in response to the war in Ukraine, now face an uncomfortable reality. Without the full weight of American logistical support, their own modernization efforts may stall. Germany’s €100 billion special defense fund, for example, was designed in part to complement U.S. capabilities, not replace them.
NATO Secretary General Jens Stoltenberg has publicly urged member states to accelerate their spending commitments, but privately, diplomats say the U.S. budget trouble has complicated those discussions. Several Eastern European nations, including Poland and the Baltic states, have expressed concern that a slower American resupply pipeline could leave them vulnerable during a potential crisis.
The Pentagon has sought to downplay the severity of the issue, insisting that core commitments to NATO’s rapid reaction force and the defense of allied territory remain fully funded. But internal budget documents reviewed by The Chronicle Page show that training exercises and infrastructure projects in the alliance’s eastern flank have already been postponed.
For European defense planners, the message is clear: the era of relying on the United States as an unlimited backstop is over. France and the United Kingdom have begun preliminary talks about increasing their own strategic stockpiles, while smaller allies like the Netherlands are exploring joint procurement agreements to reduce costs.
The budget crisis also threatens to undermine the alliance’s long-term planning. NATO’s new defense plans, approved at the Vilnius summit last year, call for a significant increase in high-readiness forces and pre-positioned equipment. Without predictable American funding, those plans may remain aspirational.
As the U.S. Congress debates a stopgap spending measure to avert a government shutdown, European capitals are watching closely. The outcome could determine not just the pace of American support for Ukraine, but the credibility of the alliance’s collective defense guarantee for years to come.
