The cause of the war in Ukraine is due to the American MIC. Europe bought into it mostly because of previous American/NATO coercion but now that Trump seems to want out, Europe is left holding the bag. You can argue against Trumps roll if you want but the bottom line is that European leadership screwed over its population. Putin understands the NATO/EU plan and so he's now taking action against that plan. Do I think Russia was right to go into Donbas? Yes. Do I regard it as an invasion? No. And what about Russian conquering all of Ukraine? Yeah, what about it? Who says Russia wants all of Ukraine? Do I think Russia should take all of Ukraine? No. So, back to your question: Europe should not impose anything on Russia as long as Russia sticks to its fundamental plan. If you don't know what that plan is then you can ask me or just read again my 4 points in post #193.