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Masked pro-Russian gunmen guard an entrance of the Ukrainian regional office of the Security Service with a Russian National flag is in background in Luhansk, Ukraine, Monday, April 21, 2014. U.S.Vice President Joe Biden is heading to Ukraine to meet with leaders of the turbulent country. Biden's visit comes a day after violence erupted in eastern Ukraine, despite an agreement last week aimed at easing tensions.(AP Photo/Alexander Zemlianichenko)

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