Secretary of Defense Pete Hegseth has announced a formal review of U.S. troop deployments in Europe while sharpening his public pressure on NATO allies to shoulder a greater share of the continent's defense burden — a combination that is reshaping the alliance's internal calculus heading into the second half of 2026.

Hegseth, who was sworn in as the 29th Secretary of Defense on January 25, 2025, has used successive engagements with NATO counterparts to lay out a clear American expectation: European members must treat continental security as their own imperative, providing an "overwhelming share" of defense efforts rather than relying on U.S. capacity as a structural backstop. That framing, delivered in February 2025, has since become the rhetorical anchor for Pentagon messaging on burden-sharing.

The force posture review follows. When Hegseth addressed the re-posturing question directly, he was explicit that any repositioning of American forces should not be read as abandonment — a caveat clearly aimed at European capitals that have spent months trying to parse how literally to take the administration's transatlantic revisionism. The assurance is real, but so is the underlying logic: the Pentagon is actively examining whether its current European footprint matches its strategic priorities.

Hegseth has simultaneously maintained that NATO itself remains, in his words, "the most successful defense alliance in history" — while insisting that its longevity depends on partners doing "far" more. Hard power, not institutional sentiment, is the currency he emphasizes. That pairing — institutional affirmation alongside structural demands — is a deliberate rhetorical posture, one that allows Washington to press for reform without formally threatening exit.

The broader context here is worth unpacking. NATO's 2% GDP defense-spending benchmark, agreed at the 2014 Wales Summit, has long been more aspirational than enforced. A number of European members have moved toward or past that threshold since Russia's full-scale invasion of Ukraine in February 2022, but the distribution remains uneven. Hegseth's insistence on an "overwhelming share" goes meaningfully beyond the 2% floor — it implies a qualitative shift in who leads and who follows on European deterrence. That is a structural ask, not just a budget line.

For European defense planners, the force posture review carries concrete operational weight. U.S. troops in Europe — currently numbering well above 80,000, elevated from pre-2022 levels — serve deterrence functions that European forces cannot replicate on short notice, particularly in terms of command-and-control infrastructure, logistics, and high-end capabilities like long-range precision fires and ISR. Any meaningful drawdown, even if framed as re-posturing rather than withdrawal, would require European NATO members to accelerate national and multilateral capability development on timelines that most defense ministries have not yet built into their planning cycles.

The political reception in Europe has been mixed. Governments that have already hit or exceeded the 2% threshold — Poland and the Baltic states most prominently — tend to read the American pressure as validating investments they were making anyway. Governments still below it face domestic political friction that abstract calls for burden-sharing do not dissolve. Hegseth's language about scorning some allies, per reporting from Reuters, suggests the Pentagon is not inclined to manage those sensitivities diplomatically.

What the review produces in concrete terms will matter more than the rhetoric around it. Force posture reviews can result in anything from a marginal rebalancing of brigade combat teams to a significant reduction in permanently stationed troops in favor of rotational presence — a model that costs less in peacetime but signals less in deterrence terms to an adversary. The distinction is strategically meaningful and will be watched closely in Moscow as much as in Brussels.

The trajectory Hegseth has set in motion asks European NATO members to internalize a shift that American administrations have gestured at for decades but rarely operationalized: that U.S. commitment to European security is conditional on Europeans demonstrating they are prepared to lead it. Whether alliance cohesion can absorb that pressure without fracture depends largely on how the review's findings are implemented — and how quickly.