An economically strong and united Europe might be a more stable centre of capitalist power in the long run
Europe had that slim chance around the 50s. Suez and then the inclusion of the UK into the EC ended that. The EU counter-pol to the US that was all the rage in the 2000-2016 era was not a sign of european strength but the american lax hand. I used to get snark by this very site when I said that the european nato states were just US puppets and that the US would tighten its grip if they showed too much sign of a divergent trajectory, lo and behold then nordstream 2 happened.
You mistake me for saying that the terror will come out of russian ukraine. The parts that will remain with ukraine will be that wound, and that will undoubtably affect russia.