This is purely my thinking out loud here and guessing, but I just wonder if this could be Putin's thinking.
Putin is a very clever man. He needs to win and wishes to look the hero to his people.
He must know there is a lot of opposition in Russia to what he is doing right now. But, what if the Ukrainian government are ousted and he puts a government in place and says that's it job, done, no more fighting, we have achieved our aim.
He then puts that out in front of the Russian people and from that point on in, any fightback from Ukraine resistance, would then be painted as terrorist acts, after all, Putin will have brought "peace and stability" to the region.
I can see the Russian people buying into that concept and therefore them then losing any sympathy for their Ukrainian brothers across the border.
Could that possibly be his plan? He doesn't care what WE think, but as has been said, I think he can only be toppled from within.
If he is suddenly seen as liberator and then peacemaker, it could change the perception of the Russian people.
Is this his mindset, that he believes the Russian people will come round in the end?