Putin described Kiev is the mother of Russian cities. These - the Russian people view Ukraine as an extension of Russia. And so there is a sense that Putin really will do whatever it takes, even in the face of overwhelming, diplomatic, and economic pressure to defend what he sees as Russia's vital interest. And I think when we're trying to understand what's going on in Ukraine we have to keep that in mind. This isn't a simple case of Putin agitating for a fight.