South Sudanese fleeing an attack on the town of Rank, on Saturday. The United Nations says when rebels seized the town of Bentiu, south of Rank, earlier this month, hundreds became victims of ethnically targeted killings. Mohamed Nureldin Abdallah/Reuters/Landov hide caption

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Hostages being held at the U.S. Embassy in Tehran in November 1979. Iran's choice for U.N. ambassador, Hamid Aboutalebi, has acknowledged that he was an interpreter for the student group that seized the compound. AP hide caption

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Russia has vetoed a U.N. Security Council resolution that would invalidate Sunday's referendum in Crimea. In Moscow, demonstrators and military veterans march in support of the Kremlin Saturday; nearby, a large march was held to protest Russia's policies. Alexander Zemlianichenko/AP hide caption

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Haitians protest against United Nations peacekeepers in Port-au-Prince in 2010. Hector Retamal/AFP/Getty Images hide caption

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Iranian President Hasan Rouhani speaks at the United Nations on Tuesday. The U.S. and Iran are taking part in talks Thursday, looking for a possible breakthrough after years of negotiations on Iran's nuclear program. Stan Honda/AFP/Getty Images hide caption

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