NATO shifts nuclear mission to F-35 jets

NATO defence ministers agreed on June 18 in Brussels to modernise the alliance's nuclear capabilities and strengthen planning (NATO NPG statement, Bloomberg). Behind the standard communiqué language sits a concrete commitment to upgrade the aircraft, bases, crews and legal permissions that keep American nuclear weapons deliverable from European soil, while Washington pulls back conventional enablers and tells allies to carry more (Tagesspiegel).

How the System Works

NATO does not own nuclear weapons. Deterrence relies on the US nuclear umbrella extended to all allies. Beneath that, a smaller group of European countries participate in "nuclear sharing" by hosting US bombs and providing aircraft and pilots trained to deliver them. The Nuclear Planning Group (where all allies except France discuss nuclear policy) coordinates consultation (NATO). The weapons stay under US custody at all times.

"Modernised capabilities" means a hardware refresh keeping that arrangement functional. The B61-12, the latest American gravity bomb deployed in Europe, needs aircraft certified to carry it. The F-35A achieved that certification in 2024, making it the first fifth-generation fighter cleared for the nuclear role (F-35 Joint Program Office). Across host countries, older Tornado and F-16 fleets are retiring. Without the F-35 transition, NATO's air-delivered nuclear mission loses its delivery vehicle.

Three countries show what that transition looks like. In Germany, the defence ministry frames its F-35 purchase as the successor capability for nuclear sharing, with Büchel air base remaining the operational centre (bmvg.de). In Belgium, defence minister Theo Francken acknowledged on June 18 that Belgium needed its F-35s before transferring all F-16s to Ukraine "because of course we have DCA capacity," a rare public nod to the country's nuclear role (NATO HQ press moment). In Italy, the same Tornado-to-F-35 handover applies at bases linked to the nuclear mission, while a judge in Pordenone weighs whether to investigate the alleged presence of nuclear weapons at Aviano (Il Fatto Quotidiano).

New Legal Ground, Old Political Limits

"Improved planning" stops being bureaucratic filler when domestic law used to block alliance contingencies. Finland's parliament voted 125-61 to remove its blanket statutory ban on nuclear weapons entering the country, opening a legal pathway for transit and crisis reception (Demokraatti, Yle). Finland has no dual-capable aircraft assigned to bomb delivery and says it will not host permanent peacetime deployments. But it removed the legal obstacle that would have forced NATO planners to route around Finland on the northern flank.

Poland sits at the other end: political ambition running ahead of operational reality. Warsaw's 32 F-35A jets make nuclear sharing imaginable, and Polish commentary treats the purchase as a stepping stone (rp.pl). But owning the right aircraft does not guarantee Washington will provide the weapons or the bunkers. No storage infrastructure exists, no US or NATO approval has been announced, and a congressional provision still frames the question as a feasibility study (forsal.pl).

France operates on a separate track. Paris keeps its nuclear forces outside NATO's sharing model; the final launch decision belongs to the French president alone. Recent signals toward Poland and other allies amount to strategic consultation and political reassurance, not a shared nuclear button (War on the Rocks). If doubts about American reliability grow, France offers a possible European supplement, but one that remains discretionary and nationally commanded.

What Stays Hidden

The June 18 statement confirmed the shift without disclosing which bases are being upgraded, which storage arrangements are changing, or which exercises were approved. That silence is structural. NATO nuclear deterrence works partly because adversaries cannot pin down exact dispositions. But the same opacity limits democratic scrutiny: parliaments fund the aircraft and bases while governments decline to confirm the mission those assets serve. Italian courts, Belgian peace movements and Finnish opposition votes all try to force a conversation that nuclear-sharing culture is designed to contain.

The unresolved question is whether upgraded hardware and expanded legal permissions add up to a credible deterrent when the conventional forces protecting those bases, the logistics sustaining them, and the American political commitment underwriting them face their own separate pressures.