Ukraine's northeastern front could decide new battle lines

Ukrainian tanks and soldiers train every day on the country's northeastern front. They throw grenades and fire machine guns at mock targets. It's only a drill. But the sounds of the real war rumbling just a short distance away underscore the high stakes in this part of Ukraine. Military officials say a much-anticipated Russian offensive has already started with fighting that could determine the next phase of the war. Time is of the essence, so speed and cohesion is the goal of the exercises. Grueling artillery battles have stepped up in recent weeks in the vicinity of Kupiansk. The strategic town is on the eastern edge of Kharkiv province by the banks of the Oskil River.