Images from Ukraine

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Uniformed men, believed to be Russian servicemen, stand guard near a Ukrainian military base outside the city of Sevastopol, March 7, 2014.

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Pro-Russian demonstrators clash with riot police during a protest rally in Donetsk, Ukraine, March 6, 2014.

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Pro-Russian demonstrators clash with riot police during a protest rally in Donetsk, Ukraine, March 6, 2014.

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A Ukrainian serviceman stands guard at a Ukrainian military base as a uniformed man, believed to be a Russian serviceman, walks nearby in Perevalnoye outside Simferopol, March 6, 2014.

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Uniformed men, believed to be Russian servicemen, walk in formation near a Ukrainian military base in Perevalnoye, outside Simferopol, March 6, 2014.

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A uniformed man, believed to be a Russian serviceman, stands guard near a Ukrainian military base in Perevalnoye, outside Simferopol, March 6, 2014.

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The Ukrainian frigate Hetman Sahaydachy enters the waters of the Black Sea port of Odessa, Ukraine, March 6, 2014.

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Members of Crimean self-defence units block a topless activist from the Ukrainian feminist group Femen during a protest near the Crimean parliament building in Simferopol, March 6, 2014.