groups fought and the incident is still under investigation. russia seized on the clash as proof that ukraine cannot keep the peace there. two burned out cars were still at the scene this afternoon. one of them riddled with bullet holes. second deadly incident in the last four days in eastern ukraine. and i want to bring in eugene rumor in washington, director of carnegie's russia program. eugene, some sobering developments over the last 24, 48 hours. this clash, a deadly clash yesterday and the day before. clear signs that the pro-russian militants that occupied the buildings and supposed to vacate them under this peace agreement agreed to on thursday refusing to do that, perhaps consolidating the gains. what does this tell us about a diplomatic way out of the crisis there? >> well, if the diplomatic deal facing a struggle to begin with, with the geneva cords, i think the odds of it being implemented