17 March 2026
France’s new forward deterrence strategy appears to be a useful addition to NATO’s deterrence architecture because it introduces the option to disperse nuclear-armed aircraft to allied territory. However, since the strategy is not accompanied by a change in the French nuclear doctrine towards flexible response, the initiative neither constitutes nor even attempts to provide an alternative nuclear umbrella for European allies.
On 2 March, French President Emmanuel Macron announced an update to France’s nuclear deterrence strategy that incorporates a new concept of forward deterrence. Some European allies will participate in French nuclear exercises, and France will have the option to disperse its strategic nuclear aircraft to their territories if they so agree. Some allies will likely opt for deeper cooperation than others.
At the same time, Macron reaffirmed the traditional French nuclear doctrine, which rejects the graduated use of nuclear weapons, apart from a one-time final nuclear warning before strategic retaliation. France will neither agree with its allies on a shared definition of vital interests that could lead to the use of nuclear weapons nor involve them in nuclear planning or launch authority. This means that the French forward deterrence strategy does not constitute a nuclear umbrella for its allies or a replacement for the US extended deterrent.
Instead, France has updated its nuclear deterrence strategy in a way that offers some benefits both to itself and to those allies who sign up for the initiative, and who likely understand what is on the table: a useful and complementary addition to NATO’s deterrence strategy, but not an extended nuclear deterrent. For this reason, some allies will not find the French offer as attractive as others.
The new dispersal option
In 2020, Macron made a largely similar offer to France’s allies but received an unenthusiastic response. This time, however, eight allies to date have agreed to participate. This can be explained both by doubts about the reliability of the US commitment to NATO and by the only genuinely new feature in the offer: the option to disperse French nuclear-armed aircraft to the territory of France’s allies.
Even if the French nuclear doctrine is designed to protect France’s vital interests rather than those of its allies, exercising such dispersal during peacetime could still contribute to deterring aggression against individual allies and Europe collectively. During war, the dispersal of French nuclear-armed aircraft to Europe would likely have a significant effect on Russia’s calculations, despite the fact that the French doctrine is one of central rather than extended deterrence.
The option to disperse air forces to allied territory also benefits France, because a dispersal operation during wartime would send such a strong deterrence signal that it effectively adds a penultimate warning option to France’s deterrence toolkit before the final nuclear warning. After dispersal, France’s strategic air forces would also be less vulnerable to pre-emption and, if moved closer to their targets, could be employed more effectively and potentially without air-to-air refuelling.
Uncoordinated dispersal carries risks
Given the potential impact of such deterrence signals, it is important that most allies who participate in NATO’s dual-capable aircraft (DCA) mission have also agreed to participate in the French forward deterrence initiative, as this should make coordination easier in a crisis. Only Italy is absent so far. During war, coordination between the dispersal of US forward-deployed nuclear weapons and French nuclear weapons could be essential, because Russia could interpret these signals in various ways. Both sequential and simultaneous dispersal could deter aggression or its escalation, but uncoordinated dispersal could instead be harmful due to its potential to lead to miscalculations by the adversary.
A further potential issue with the dispersal of aircraft is associated with France’s massive retaliation strategy. Its rigidity can make these dispersal operations vulnerable to so-called salami-slicing tactics: a series of pre-emptive strikes on single dispersed nuclear-armed aircraft would be unlikely to justify a French nuclear retaliation or final warning and could consequently chip away at the credibility of the French doctrine.
The same tactic could also be used against US nuclear weapons, but the United States’ flexible response doctrine makes it less vulnerable to such a challenge. Attacking strategic nuclear forces, as would be the case with French aircraft, is one thing, but attacking a limited forward-deployed capability, as is the case with US nuclear weapons in Europe, is another. Since the French deterrence strategy is intended to complement rather than replace NATO’s current deterrence strategy, this is a minor issue to be considered rather than a serious flaw that undermines the French initiative.
NATO continues to rely on the US extended deterrent
Perhaps the most important feature of France’s modified deterrence strategy, however, is not what has been introduced but rather what is absent. The initiative occurs against the backdrop of a growing Russian military threat, doubts in Europe about the reliability of the United States as an ally, and the consequent debate over an alternative nuclear umbrella based on European nuclear weapons.
France and the United Kingdom, Europe’s two nuclear powers, understand the need to bolster their deterrents. In July 2025, they issued the Northwood Declaration, which established their intent to coordinate operations of their nuclear forces, potentially allowing more effective submarine patrolling and coordinated decisions during war, perhaps even in targeting. The UK also decided to rejoin NATO’s DCA mission, acquiring nuclear capability for the Royal Air Force for the first time since the 1990s.
While these are significant decisions that bolster the nuclear deterrents of the UK and France, they appear to be crafted to make the most of their current nuclear doctrines and roles in NATO deterrence rather than to constitute a fundamental reappraisal aimed at creating a credible alternative nuclear umbrella based on European nuclear weapons. If France or the UK wanted to take that step, they would need to develop, either individually or jointly, a non-strategic nuclear capability that would allow them to adopt a credible flexible response doctrine, which is required for credible extended deterrence.
There are, however, no indications so far that France or the UK intend to modify their approach to nuclear deterrence to that degree, although the possibility cannot be discounted that their established nuclear cooperation may eventually move in that direction. For now, NATO’s extended deterrence still relies on US nuclear weapons, with both France and the UK comfortable in their complementary role.
Photo: Yoan Valat / AFP / Lehtikuva
