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Simferopol, Ukraine (CNN) - Political tension roiled in Ukraine's Crimea region Friday, as U.S. officials received assurances that Russian military activities there were routine and not intended as a threat to Ukraine sovereignty.
At the same time, Ukrainian officials grappled with rising secessionist passions in the Russian-majority region and faced major disruptions to airport and communications services.
The region's airspace was closed Friday. Further, the government accused Russian Black Sea forces of trying to seize two airports in Crimea but said Ukrainian security forces had prevented them from taking control.