The United States has delivered an unmistakable message to its NATO allies: the era of overwhelming American military primacy on the European continent is over, and a leaner, more self-reliant alliance must take its place. At a gathering of defence ministers in Brussels, US Defence Secretary Pete Hegseth called for a wholesale reboot of the 32-nation bloc into what he termed “NATO 3.0” — a “real, hard-line military alliance” capable of deterring threats without depending on Washington’s traditional largesse. The rhetorical push was given immediate operational weight by NATO Secretary-General Mark Rutte, who confirmed to journalists that a long-anticipated reduction of US forces in Europe would begin “immediately,” explaining that America “cannot currently expend its resources” as it once did.

Viewed from Washington, the pivot is both a fiscal imperative and a strategic recalibration. Hegseth, who earlier this year delivered blunt assessments of European and Canadian defence budgets, reiterated that allies must now shoulder the primary burden for their own security. The US has already signalled it will no longer supply certain warships and aircraft in the event of an allied attack, a move that has concentrated minds in European defence ministries. Rutte, while insisting that Hegseth remains “a great friend of NATO,” acknowledged the new reality: “He has made clear that European countries and Canada must set their defence budgets to match that of the United States.” The benchmark, agreed at last year’s NATO summit in The Hague, is a target of 5 percent of GDP — a figure that most European members remain far from achieving.

In European capitals, the reaction is a mixture of grim acceptance and quiet anxiety. Nordic members, long attuned to the threat from Russia, have been among the fastest to ramp up spending, but larger economies such as Germany and France face domestic political hurdles in meeting the 5 percent aspiration. The Brussels meeting and a forthcoming NATO summit in Ankara in July are set to become stock-taking exercises, where allies will be pressed to demonstrate concrete progress. From Moscow’s perspective, the immediate drawdown of US troops — confirmed by Rutte — will be read as a validation of the Kremlin’s long-standing narrative that American security guarantees are unreliable, even as the NATO secretary-general expressed hope that Washington would “do the maximum” to defend Europe in a crisis.

The push for a “NATO 3.0” framework is more than a budgetary argument; it represents a structural shift in the alliance’s centre of gravity. Hegseth’s vision implies a Europe that not only pays more but also plans, commands, and equips its own defence architecture, with the US moving into a supporting rather than leading role. Analysts in London note that this transition, if managed clumsily, could fracture the alliance’s cohesion at a moment when the strategic environment — from Russia’s revanchism to instability on Europe’s southern flank — demands unity. The Ankara summit in July will be the first major test of whether European allies can translate the rhetoric of “NATO 3.0” into credible military capability, or whether the alliance’s reboot will instead expose its internal fault lines.