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Ukraine warns Russia against 'act of aggression' in Crimea

Ukraine's acting president has warned Russia that troop movements outside its naval base in Crimea would be seen as an "act of aggression". Armed men seized regional government headquarters and parliament and the Russian flag is flying from buildings

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Biden speaks to Ukraine president about clashes

US Vice President Joe Biden has spoken to Ukrainian President Viktor Yanukovich today by phone, the White House announced.

The scene tonight at Kiev's central Independence Square, where protesters have gathered. Credit: REUTERS/Vasily Fedosenko

This is the latest in a series of calls between the two men since clashes between anti-government protesters and riot police erupted in the capital Kiev.

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