Russia is winning the war militarily and they will dictate terms. The two options on the table will be WW3 or Ukraine breaks with the west. Also, Europe is in no position to do anything on their own. They don't have the industrial capacity that comes anywhere close to Russia. Even the US can't keep up https://www.cnn.com/2024/03/10/politics/russia-artillery-shell-production-us-europe-ukraine/index.html