Ukrainian government troops and pro-Russian separatist forces on Sunday fierce fighting, which makes the Ukrainian authorities to make further unilateral ceasefire declared by pressure. Meanwhile, Russian President Vladimir Putin urged the Ukrainian authorities to negotiate with the rebels. Russia and Ukraine were held in Nazi Germany invaded the Soviet Union anniversary, Putin and Ukrainian President Poroshenko emphasized the need to achieve peace in eastern Ukraine. Friday night, seven-day ceasefire implemented soon under pressure, the Ukrainian government blamed separatist forces attacked military bases and outposts near the border with Russia and Ukraine, after violent clashes continued through Sunday. "Unfortunately, our eyes ......