In 2020, France offered Europe its nuclear umbrella
https://www.elysee.fr/emmanuel-macron/2020/02/07/speech-of-the-president-of-the-republic-on-the-defense-and-deterrence-strategy.en
It wasn't accepted then.

Now France, as the only EU country with nuclear weapons, is again proposing deterrence.

https:/ /www.france24.com/fr/france/20250301-dissuasion-atomique-macron-relance-le-debat-sur-un-parapluie-nucleaire-europ%C3%A9en