France, March 3 -- President Emmanuel Macron set out the plan in a speech at the Ile Longue submarine base on Monday, announcing an increase in warheads and what he called "advanced deterrence". He also invited European partners to host French assets, take part in exercises and integrate conventional forces under Paris's sole command.

Framed as protecting "vital French interests" in Europe, the proposal raises the possibility of extending a French "nuclear umbrella" to European partners. Macron did not provide a timeline or cost for the plan. He also said Paris would "no longer be disclosing details on its nuclear stockpile".

France already has one of the world's most capable independent nuclear forces, with around 290 operational warhe...