You'd be right if not for what Russia plans to do next in the event of a victory in Ukraine. Ukraine is not the target, it's a target in the sequence of targets.
A few months before the war broke out Putin issued a very clear ultimatum to the West: withdrawal of NATO forces and installations from every country east of Germany. He issued none to Ukraine because he wanted the entire country.
The war will continue for as long as Russia is able to wage it, therefore we must destroy Russia as a political system that exists today. Or declaw it to the point of irrelevance. That is the way out of this war, unless you're willing to go back to USSR borders. And even then it's not clear they would stop.
Russia is surprisingly open about its goals. Just read what serious people in the Kremlin say over the years (and definitely tune out the garbage that they spew on Rossiya 1 for the older generation homo-sovieticus, no one in the Kremlin cares about that shit). Thanks to the large influx of Russian-speaking immigration we have quite a lot of capable experts that understand it well.
War, unlike marriage, only requires consent on one side. I.e. the "collective west" is in a war just because Russia wants that, and there's nothing "West" can do to exit the war. They can only win it.
