NATO can't protect Europe from Russia because the US has defected. The EU can't because UK is no longer a member. The UN can't because of Russia & US.
We need a body with Europe + UK but not Russia + US, with existing admin infrastructure.
What I'm saying is: arm the Eurovision Song Contest.
"Grandpa, why was Australia fighting a war in Europe?"
"Well, it's all got to do with being a member of the European broadcasting union, and that channel that's all rude stuff and Hitler was a member of something. Would you like to hear how WW1 started, it might be simpler?"