I'm not crazy about the concept, either, but I'm also going to call a spade a spade. When Ukraine falls, the front will shift to new borders, introducing war and displacement to new areas. If Russia advances, all of Europe will have been able to help prevent it, but did not. They would have let Ukraine get ground to dust for a few years, only to fall anyway. Sure, they helped a little, with training and supplies, but the death toll is uniquely Ukrainian.