As ceasefire talks continue between the Ukrainian government and pro-Russia rebels, military hostilities have escalated. Kiev reports that rebels killed four of their soldiers, injuring at least 15. The eastern Ukrainian city of Donetsk, reports the heaviest shelling. Each side blames the other for scores of ceasefire violations. We get an update on the crisis from Matthew Rojansky, director of the Kennan Institute at the Wilson Center. (Photo: Associated Press/Andrew Kravchenko, Pool)