To be honest, I cannot imagine a scenario in which he can be removed externally, because of Russia's nuclear capacity. Even if he is removed internally, I very much doubt that Russia would be willing to send him to the International Court of Justice. I cannot see that happening either.
In terms of the question of whether he is replaced internally by another figure who does the same thing, I think we have to be realistic that if he is replaced by another figure, we don't expect that Russia will suddenly become a democracy, become friendly, and co-operate with the west. The goal is to replace him with someone who has a more realistic view of the neighbourhood, who realizes that countries are now attached to their independence, and who switches to a policy where they attempt to influence the neighbourhood through other levers, not by taking countries over.
I think that's a realistic chance. He could still be replaced within an authoritarian coalition and a largely authoritarian government, but with someone who does not have such expansionist goals.