What the Budget Doesn't Buy
European capitals are funding the wrong kind of deterrence. The platforms, readiness targets and budget commitments accumulating since 2022 address the threat Russia signals in public. Russian nuclear coercion operates in a different register, below the threshold where conventional deterrence activa
Germany is on track to lead European defence spending within two years. The Zeitenwende is producing real outputs: recruitment is up, platforms are being ordered and the political consensus on defence as a national priority has held longer than most observers expected. The UK has made binding commitments. France is already there. By the measure NATO burden-sharing debates have used for a decade, Europe is finally paying.
The measure is the wrong one.
European defence investment since 2022 has been calibrated against a specific threat: Russian conventional military action crossing NATO territory, triggering Article 5 and demanding combined conventional defence. That threat is real and the investment is beginning to address it. German capability will be there within two to four years. Even where UK delivery has lagged behind commitment, the direction is clear. The conventional deterrence gap is closing.
Russian nuclear coercion operates in a different space. Moscow's nuclear signaling is designed to work before the conventional confrontation begins, in the political moment where governments are deciding whether to mobilise, escalate or absorb. A nuclear threat against a capital forming a coalition creates a political crisis before any conventional defence mechanism activates. The toolkit is calibrated for that moment.
European deterrence doctrine has no parallel instrument. Nuclear capability addresses nuclear coercion, and Europe has one nuclear power whose arsenal could plausibly function as a continental deterrent: France. Macron has proposed exactly that. A French nuclear umbrella, extended to European partners as a shared deterrent and supported by European financing.
The proposal has a structural problem. The French nuclear force is a presidential instrument, with its use governed by French national sovereignty rather than any treaty obligation to European partners. What Macron offers is a statement of current intent. Deterrence requires a credible commitment that survives changes of government. The French umbrella, as currently constituted, is a signal.
Macron's domestic position makes the question immediate. The umbrella is being offered by a politically weakened president whose successor may hold different foreign policy priorities. The gap between the French nuclear umbrella as an analytical concept and as a durable institutional commitment is measured in electoral cycles. Europe has not converted the signal into a structure.
The continent's nuclear deterrence rests on two arrangements: the American extended guarantee, which has been in visible question since January 2025, and the French presidential posture, which changes with the Élysée. Russia's nuclear coercion toolkit is calibrated for precisely this architecture. The conventional spending surge closes the conventional gap. The below-threshold political space stays open.