I don't think this really surprises anyone. Even though Putin portrayed an exterior of cooperation and friendliness, deep down he is a product of the Soviet government hierarchy, a career official who would love to see Russia return to the glory days of the Soviet Union.
It's be pretty apparent since at least the mid-2000s that Putin was making some very tactical and cerebral moves behind the scenes in order to consolidate his power, such as allowing the oligarchs essentially free reign in their business practices in exchange for staying out of politics. With his control of the money, the state, and now the constitution, who could hope to oppose him?
You have to hand it to the man, he is without a doubt one of the best political tacticians of our time. He knows that Europe and the US are not willing to sacrifice the blood and money to protect Crimea/eastern Ukraine. Even if Soviet troops rolled into Kiev, would the West do anything besides slap some sanctions on? I seriously doubt it, with a majority of Americans now favoring an isolationist foreign policy.
Anyways, sorry for the TL;DR. Have a final tomorrow on some of this stuff, I figure if I'm not going to be studying I might as well be talking about something moderately related to what I should be studying.