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Pro-Russian activists storm an administration building in the center of Luhansk, Ukraine, one of the largest cities in Ukraine's troubled east, Tuesday, April 29, 2014, as demonstrators demand greater autonomy for Ukraine's regions. The action on Tuesday further raises tensions in the east, where insurgents have seized control of police stations and other government buildings in at least 10 cities and towns.(AP Photo/Alexander Zemlianichenko)
Pro-Russian activists storm an administration building in the center of Luhansk, Ukraine, one of the largest cities in Ukraine's troubled east, Tuesday, April 29, 2014, as demonstrators demand greater autonomy for Ukraine's regions. The action on Tuesday further raises tensions in the east, where insurgents have seized control of police stations and other government buildings in at least 10 cities and towns.(AP Photo/Alexander Zemlianichenko)

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U.S. Amb.: Russia exporting "thuggism"

Wolf Blitzer talks to the U.S. ambassador to the OSCE, who says he is sure that Russia is on the ground in east Ukraine.

U.S. Amb.: Russia exporting "thuggism"

Wolf Blitzer talks to the U.S. ambassador to the OSCE, who says he is sure that Russia is on the ground in east Ukraine.