Four days before a watershed presidential election in Ukraine, a new round of deadly fighting flared in the east of the country on Thursday. At least 13 government soldiers were reported killed in an abrupt escalation of violence as pro-Russian separatists struck back against government efforts to subdue them. The clashes could represent a risk for the interim authorities in Kiev, the capital, who have claimed to be getting the upper hand against the rebels, encouraged by rifts among separatist groups occupying public buildings in numerous cities in the southeast. In a posting on Facebook, Ukraine’s acting prime minister, Arseniy P. Yatsenyuk, accused Russia of escalating the conflict in eastern Ukraine and of trying to disrupt Sunday’s election. He called for an emergency meeting of the United Nations Security Council and said he would provide “evidence” to support his claim. News reports quoted acting President Oleksandr […]