PARIS — France is warming up to the possibility of seizing Russian frozen assets to help Ukraine, said an official with direct knowledge of talks within the French government and between Paris and Berlin.

"Even while Russia talks about peace, they are continuing their relentless aggression," Starmer said at the meeting.

France on Monday said a plan for a one-month truce between Russia and Ukraine would test Moscow's commitment to ending the war it began with its 2022 invasion. In an initial phase, it is "a way of verifying that Russia is willing to end this war",