There was no sense in crushing the opposition if it meant inviting the Russian wolf into the sheep pasture.
Even Lukashenko in Bielorussia has backed off of some the closer "economic" cooperation with Putin because he knows the Russians would simply come in and elbow him aside.
Putin has such a bad reputation even his allies are afraid of him.
Putin never had a chance at the entirety of Ukraine. He isn’t loved by everyone in eastern Ukraine. It’s even worse in western Ukraine.