He's always saying don't humiliate Putin. It's because he's afraid of what he might do.
Putin has the choice to leave Ukraine. He never takes it. And so the Ukrainians have to fight to eject him. He's a pig-headed man.
The thing that needs to happen to get Russia out of this mess is for the Russian people to remove its leaders. Get new leaders who want peace and make no claim to Ukrainian land. It's the only path that works.