It won’t work if you just announce oh this country is going to get split. It has to happen organically, or it won’t happen at all.
I’m not saying it will happen I’m just saying that it would be the best outcome. I’m saying that NATO don’t particularly want to replace Russia with pseudo Russia, there really isn’t any point doing that. So the original comment about having Ukraine take over Russia just doesn’t work in his absolutely not in NATO’s interests.
And that’s before you even look at the problem of subjugating a population, some of which will be fighting back, leading to a never-ending guerrilla war. Which is another thing NATO have no interest in happening, especially if the ultimate objective of Ukraine is to join NATO.