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.
It's a (notionally) democratic body, it can render decisions from all its member states within a couple of ours, and it has already shown it learnt an important lesson from 20th century conflict: if you want to hold buck the Russians, send a bunch of terrifying Finns.