I don’t think Russia will take the rest of the Ukraine.
Russia wants a warm weather port. They seem to have control of one now.
Ethnic Ukrainians love Russia like Jews love Germany. If Russia occupies the Ukraine, they will experience another Afghanistan. And the Russian military of 2014 is nowhere near is powerful as it was in 1980.
I believe their threats to occupy the rest of the Ukraine is simply a leverage point in any future negotiations over Crimea.
It's all a matter of the right time for every step.
He took a part of Georgia a while back, and still has it.
He yearns for the old USSR (he says the disillusion of that oppressive regime was the worst thing that ever happened to the planet [paraphrase]) and is working on taking it all back and then some.
He hasn't backed away at all from the communist goal of world domination.
He's already got Obama in his back pocket. [Obama to Putin's lackey before the last election and after Putin was reelected: Tell Putin I will capitulate to his every whim when I am reelected...kind of whispered but caught on mike. Actual quote :"This is my last election," Obama told Medvedev. "After my election I have more flexibility."]