United Nations

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U.S. Ambassador to the United Nations Samantha Power speaks during a meeting of the U.N. Security Council on Ukraine, Monday March 3, 2014, at U.N. headquarters. (AP Photo/Bebeto Matthews)

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U.N. Russian Ambassador Vitaly Churkin speaks during a meeting of the U.N. Security Council, Monday, March 3, 2014 at U.N. headquarters. (AP Photo/Bebeto Matthews)

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U.N. China Ambassador Liu Jieyi speaks during a U.N. Security Council meeting on the Ukraine, Monday, March 3, 2014 at U.N. headquarters. (AP Photo/Bebeto Matthews)

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U.N. Russian Ambassador Vitaly Churkin arrives for a meeting on the Ukraine in the U.N. Security Council, Monday, March 3, 2014 at U.N. headquarters. (AP Photo/Bebeto Matthews)

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U.N. Russian Ambassador Vitaly Churkin, far left, speaks after listening to U.N. Ukraine Ambassador Yuriy Sergeyev, far right, during a U.N. Security Council meeting on Ukraine, Monday March 3, 2014 at U.N. headquarters. Ukraine's mission to the United Nations claimed Monday that 16,000 Russian troops have been deployed in the strategic Crimea region, while Russia's U.N. ambassador told an emergency Security Council meeting that Ukraine's fugitive president requested them. (AP Photo/Bebeto Matthews)

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U.N. Russian Ambassador Vitaly Churkin, far left, listens as U.S. Ambassador to the U.N. Samantha Power, far right, speaks during a meeting of the U.N. Security Council meeting on Ukraine, Monday, March 3, 2014, at U.N. headquarters. (AP Photo/Bebeto Matthews)

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U.N. Security Council meets on Ukraine, Monday March 3, 2014 at U.N. headquarters. Ukraine's mission to the United Nations claimed Monday that 16,000 Russian troops have been deployed in the strategic Crimea region, while Russia's U.N. ambassador told an emergency Security Council meeting that Ukraine's fugitive president requested them. (AP Photo/Bebeto Matthews)