Reuters

Ukraine standoff intensifies, Russia says sanctions will 'boomerang'

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A uniformed man, believed to be a Russian serviceman, stands guard near a Ukrainian military base in the village of Perevalnoye, outside Simferopol, March 7, 2014. REUTERS/Vasily Fedosenko

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An uniformed man, believed to be a Russian serviceman, stands guard near a Ukrainian military base outside the city of Sevastopol, March 7, 2014. REUTERS/David Mdzinarishvili

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Uniformed men, believed to be Russian servicemen, walk in formation near a Ukrainian military base in the village of Perevalnoye outside Simferopol, March 7, 2014. REUTERS/Vasily Fedosenko

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Uniformed men, believed to be Russian servicemen, walk in formation near a Ukrainian military base in the village of Perevalnoye outside Simferopol, March 7, 2014. REUTERS/Vasily Fedosenko

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Participants hold placards and shout slogans during an anti-war rally in front of the Russian embassy in Kiev March 7, 2014. REUTERS/Gleb Garanich

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Pro-Russian supporters gather near a Ukrainian military base in the village of Perevalnoye outside Simferopol, March 7, 2014. REUTERS/Vasily Fedosenko

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Pro-Russian supporters gather outside a Ukrainian military base in the village of Perevalnoye outside Simferopol, March 7, 2014. REUTERS/Vasily Fedosenko

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