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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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US Vice President Joe Biden calls Ukraine's president

Vice President Joe Biden called Ukraine's president, Viktor Yanukovich, on to express grave US concern at rising violence in Kiev and to urge him to pull back government forces and exercise maximum restraint.

The vice president further underscored the urgency of immediate dialogue with opposition leaders to address protesters' legitimate grievances and to put forward serious proposals for political reform.

– White House statement

On a day Ukrainian riot police charged protesters occupying a central Kiev square, Biden made clear to Yanukovich that the United States condemns violence by any side, "but that the government bears special responsibility to de-escalate the situation," a White House statement said.

It said the United States is committed to supporting efforts to promote a peaceful resolution to the crisis in a way that "reflects the will and aspirations of the Ukrainian people."

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