At least eight Ukrainian security personnel were killed and 18 wounded in overnight clashes with pro-Russian separatists in eastern Ukraine three days before a presidential election in the former Soviet Republic.
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Security sources said on Thursday the main clash took place about 20 km (12 miles) south of the industrial hub of Donetsk, which is now in the hands of the separatists who say they will disrupt the election.
Ukrainian forces also fought separatists in the neighboring Luhansk region but there was no word about any casualties there.
The defense ministry confirmed that several people had been killed in the firefight near Donetsk but gave no precise death toll. It said the clash occurred when gunmen opened fire on an army checkpoint near the town of Volnovakha.
Separately, Ukrainian border guards said they had rebuffed an attempt by dozens of separatists, armed with grenade launchers and rifles, to enter the Luhansk region overnight from Russia. Several guards were hurt in the fighting.
Ukrainian security forces and the pro-Moscow separatists have clashed repeatedly in recent weeks in eastern Ukraine, where the breakdown of security has rattled the pro-Western interim government in Kiev.
Kiev has acknowledged that Sunday's election cannot be held in parts of the Donetsk and Luhansk regions and has accused Moscow of deliberately seeking to undermine Ukrainian democracy, a charge echoed by the United States and European Union.
Russia denies the legitimacy of the current Kiev government, which took over after mass street protests toppled Moscow-backed
president Viktor Yanukovich in February. He fled to Russia and in March Russia seized Ukraine's Black Sea peninsula of Crimea.
President Vladimir Putin asserts that Moscow has the right to intervene on behalf of Russian speakers outside Russia's borders and has expressed sympathy for people in eastern Ukraine who he says face discrimination and harassment by the Kiev government.