Like a doomsday machine? Might work (and also might find you with very few allies). But it wouldn’t work without loudly declaring your intentions beforehand, and apart from your post I have nowhere found any indication this is France’s nuclear doctrine.

You launch everything on the one attacking you, not just everyone.

How does defensive nuclear strikes amounts exactly to:

anyone uses nukes, they launch everything they have against all nuclear powers

?

Source ?

That’s not an answer to my question. What you described sounds most like Israel’s Samson Option and not anything like I’ve ever heard of France’s nuclear doctrine.

Isn’t that Israel’s nuclear doctrine?

What’s next? Windows renamed to Windows Copilot?