France has taken a humongous warmonger penalty for not only dropping an atomic weapon on another nation, but doing so to one of their own allies.
Due to such a crass action, France has been deemed an enemy of the world and of world peace.
Any alliances, trades, agreements, or favor held for such a barbaric nation will lose you large amounts of favor with foreign nations every turn.
If France does not cease and desist, the rest of the world will be tasked with putting down such a rabid dog.