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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 warns Russia over risk of Ukraine 'miscalculation'

The US has warned Russia over their military exercises along the border with Ukraine, saying they should not take any steps that could be misinterpreted or "lead to miscalculation".

Russia's military exercises follow its pledge to "strongly and uncompromisingly" react to any violation of Russians' rights in Ukraine. Credit: EBU

"I'm closely watching Russia's military exercises along the Ukrainian border," U.S. defence secretary Chuck Hagel said at a NATO news conference.

"I expect Russia to be transparent about these activities, and I urge them not to take any steps that could be misinterpreted, or lead to miscalculation during a very delicate time - a time of great tension."

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