2,000 pro-Russian protesters at Crimea parliament

2,000 pro-Russian protesters are demonstrating outside Ukrainian government buildings on the country's Crimea peninsula.

ITV News Europe Editor James Mates and ITV News cameraman Mark Nelson have tweeted photos of the protest, which follows the seizing of a regional government building by armed men.

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Pro Russian protesters parade am enormous flag shouting 'Russia, Russia'. 2,000 or so outside #crimea parl. #Ukraine http://t.co/M3L7SVlpUU

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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