U.S. troops are in Ukraine and the Kremlin isn't happy

The United States Army announced on Friday that about 300 troops, based in Italy, had arrived in western Ukraine for a six-month training rotation for three battalions of Ukraine’s National Guard. It is the first training mission by American troops in Ukraine since the war in the southeast began. Andrew Roth of the New York Times joins Hari Sreenivasan via Skype from Moscow, to discuss.