Let's not forget, RUS did the same and it's still doing day and night. Even if UA wouldn't made the best sabotage in the world ever, the RUS would still bomb UA just because they can.
Putin is not dumb. He will prolong the instability in the region as much as he can.
And Europe is dumb enough to think their infinite sanctions packets will stop him.
We can be happy Putin have the last word. If his dog Medvediev took over, nukes would fly over EU and UK!