Vladimir Putin is a Russian czar. He's kind of a mix of Peter the Great and Stalin. He's got both in his veins. And he looks out first and foremost for the national security interests of Russia. He accepts that, in Eastern Europe, that is a Russian backyard, that is a Russian sphere of influence. Ukraine lives most uncomfortably and unhappily in a Russian backyard.

U.S. Constitution declares rather unambiguously that Congress has the responsibility to “declare war.

But there are realities governing what they can do. And Ukraine cannot live with the false image that somehow or another the West will come and rescue her. It's not going to happen.

Russia can never be an empire unless it is in control of Ukraine.

We had in the West a very romantic vision of Russia back in 1991, when the Soviet Union died and whatever is Russia began to emerge. And we began to think of it as a democracy. We're going to bring it into the West. All is going to be wonderful. That was never in the cards.

Putin is a despot, and he's a very good despot. And he will see things in a narrow way. What is good for Russia? That is what he will do. If that's represented by a move toward the Baltic, that would be very dangerous, but he would do it, on the assumption that he would ask himself the question: I am prepared to fight for Estonia. Is the United States? Is Germany? Is Britain, France?

Putin never wanted all of Ukraine. He wanted for historical purposes to take Crimea. He did. Then he wanted a part of Ukraine that he could always use to advance Russian interests. And he is now at a point where nobody in the West is shouting, hey, stop. Give us back Crimea. It's all accepted. And so he has won.