Russian Troops Advance

This episode contains strong language. On Monday night, as tensions deepened between Russia and Ukraine, President Vladimir V. Putin sent troops into two regions in eastern Ukraine where separatist forces are friendly to Moscow. With dispatches from our reporters on the ground, we analyze why the crisis has deteriorated in the past few days and whether the orders are a precursor to a wider war. Guest: Valerie Hopkins, a correspondent based in Moscow for The New York Times.