France expands nuclear arsenal, extends deterrence to European allies

In a ceremony at the Ile Longue naval base near Brest, President Emmanuel Macron announced a major upgrade to France's nuclear arsenal and a new deterrence framework for European partners. He framed the move as a response to a more unstable strategic environment, saying the next 50 years will be an era of nuclear weapons.

The plan includes increasing the number of French nuclear warheads and, by 2036, launching a new nuclear-armed submarine to be called The Invincible. Eight European countries — the United Kingdom, Germany, Poland, the Netherlands, Belgium, Greece, Sweden, and Denmark — would participate in an 'advanced deterrence' arrangement. They could take part in exercises using France's air-launched nuclear capacity and host air bases for French bombers, allowing France’s Strategic Air Forces to spread across the European continent and complicate adversaries' calculations. Partners would also share in auxiliary capacities under the new doctrine, such as space-based warning systems, air defense to shoot down incoming drones and missiles, and long-range missiles.

If adversaries have the audacity to attack France, Macron warned, there will be an unsustainable price to pay. Officials described the shift as the most significant evolution of France's nuclear doctrine in years, signaling a deeper commitment to European security and a broader deterrence umbrella that stretches beyond Paris alone.

The move is presented as a bid to reassure allies amid geopolitical tensions and to project unity across a wider swath of Europe, even as questions remain about the practicalities, costs, and political implications of a more expansive nuclear-sharing framework.

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