A pro-Russian rebel prepares to fire a rocket propelled grenade on the rooftop of an apartment building during clashes during clashes as they attack a border guard base held by Ukrainian troops on the outskirts of Luhansk, eastern Ukraine, Monday, June 2, 2014. Some hundreds of pro-Russia insurgents attacked the base on Monday, with some firing rocket-propelled grenades from the roof of a nearby residential building. At least five rebels were killed when the guards returned fire, a spokesman for the border guard service said. (AP Photo/Vadim Ghirda)
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