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Once the war is over and Russia doesn't do that, what will European leaders do? How will they justify everything they’ve done?

Quite easily actually: "The only reason why Russia hasn't invaded us is because we showed them in Ukraine not to mess with us." Or any of a thousand other variations of that sort of cope. There is always a way to spin the narrative so that a defeat looks like a victory, so that the lie can be maintained. It's all to easy because Russia cannot disprove a negative. "Only if we do X, Y, Z will Russia not attack us." - "See, Russia did not attack, and that is only because we did X, Y, Z; which proves that we were right all along and Russia would have attacked if we didn't do X, Y, Z."