Violence erupts amid attempts at new cease-fire in eastern Ukraine . The violence comes as the United States and Europe are trying to negotiate a deal that would end months of fighting between Ukrainian forces and pro-Russian separatists. Poroshenko declares cease-fire . Ukrainian guards repelled a separate attack at a checkpoint nearby . Kremlin statement says Putin supports a cease-fire .
Violence erupts amid attempts at new cease-fire in eastern Ukraine . The violence comes as the United States and Europe are trying to negotiate a deal that would end months of fighting between Ukrainian forces and pro-Russian separatists. Ukrainian guards repelled a separate attack at a checkpoint nearby . Kremlin statement says Putin supports a cease-fire .