Yes, but although Putin is a bloody bastard, he's not stupid. His plan isn't to take entire control of Ukraine militarily but to swap the legit government with a puppet one he would control at will. Once he succeed, which is a matter of a few days, he'll gradually withdraw most of the forces, things will slowly return to normal and in a few years Ukraine will essentially (if not effectively) annex itself to Russia, with both the EU and US doing nothing but economic sanctions Putin and the oligarchs were long prepared against. Most of Europe depends on Russian gas, which means the moment those sanctions become too harsh is the moment he'll either cut our supply or further raise the prices (my last heating bill already doubled). That's his guarantee against any real action. I'm sorry, but Ukrainian people are screwed.