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Ukraine crisis: Russian flags at Donetsk government building

7 April 2014 Last updated at 21:44 BST

Security officials in Ukraine are being sent to the eastern cities of Donetsk, Luhansk and Kharkiv following the occupation of several government buildings by pro-Russian groups.

In Donetsk, the people who seized the regional administration building have announced the creation of a sovereign "people's republic".

They have also called for a referendum and asked Moscow to send in a peacekeeping force.

The BBC's Steve Rosenberg reports from outside the government buildings in Donetsk.