Donetsk

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People gather near a barricade built up to thwart police from retaking the regional administration building in Donetsk, Ukraine, late Monday. (Associated Press)

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People gather near a barricade with razor wires at the regional administration building in Donetsk, Ukraine, late Monday, April 7, 2014. Outside the Donetsk building, a barricade of car tires and razor wire was built up to thwart police from retaking it. Interfax cited police in Donetsk as saying one armed group fired into the air and attempted to seize the regional state television broadcaster Monday but retreated after police and guards in the building also fired warning shots into the air. (AP Photo/Alexander Ermochenko)

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An activist in a handmade metallic helmet stands behind a barricade at the regional administration building in Donetsk, Ukraine, Monday, April 7, 2014. Outside the Donetsk building, a barricade of car tires and razor wire was built up to thwart police from retaking it. Interfax cited police in Donetsk as saying one armed group fired into the air and attempted to seize the regional state television broadcaster Monday but retreated after police and guards in the building also fired warning shots into the air. (AP Photo/Alexander Ermochenko)

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People gathered in front of a barricade at the regional administration building in Donetsk, Ukraine, Monday, April 7, 2014. A Ukrainian news agency is reporting that pro-Russian separatists who have seized the regional administration building in the eastern Ukrainian city of Donetsk proclaimed the region an independent republic. The activists on Monday also called for a referendum on the sovereignty of the Donetsk region, which borders Russia, to be held no later than May 11, the Interfax news agency reported. (AP Photo/Andrey Basevych)

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People gathered near of a barricade with razor wires at the regional administration building in Donetsk, Ukraine, Monday, April 7, 2014. Outside the Donetsk building, a barricade of car tires and razor wire was built up to thwart police from retaking it. Interfax cited police in Donetsk as saying one armed group fired into the air and attempted to seize the regional state television broadcaster Monday but retreated after police and guards in the building also fired warning shots into the air. (AP Photo/Andrey Basevych)

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Activists prepare a barricade inside the regional administration building in Donetsk, Ukraine, Monday, April 7, 2014. A Ukrainian news agency is reporting that pro-Russian separatists who have seized the regional administration building in the eastern Ukrainian city of Donetsk proclaimed the region an independent republic. The activists on Monday also called for a referendum on the sovereignty of the Donetsk region, which borders Russia, to be held no later than May 11, the Interfax news agency reported.(AP Photo/Alexander Ermochenko)

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Activists gather in front of a barricade at the regional administration building in in Donetsk, Ukraine, Monday, April 7, 2014. A Ukrainian news agency is reporting that pro-Russian separatists who have seized the regional administration building in the eastern Ukrainian city of Donetsk proclaimed the region an independent republic. The activists on Monday also called for a referendum on the sovereignty of the Donetsk region, which borders Russia, to be held no later than May 11, the Interfax news agency reported.(AP Photo/Alexander Ermochenko)

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Activists prepare a barricade inside the regional administration building in Donetsk, Ukraine, Monday, April 7, 2014. A Ukrainian news agency is reporting that pro-Russian separatists who have seized the regional administration building in the eastern Ukrainian city of Donetsk proclaimed the region an independent republic. (AP Photo/Alexander Ermochenko)