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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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NATO chief urges Russia not to escalate Ukraine tension

The Secretary General of NATO has expressed concern over the unrest on Ukraine's Crimea peninsula.

Anders Fogh Rasmussen used Twitter to urge Russia not to take action that could escalate the situation.

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