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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President Obama addresses the 68th session of the United Nations General Assembly at the United Nations in New York. Timothy Clary/AFP/Getty Images hide caption

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A doctor takes an HIV test from an athlete during the 18th National Sports Festival in Lagos, Nigeria, last December. Sunday Alamba/AP hide caption

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Near Islamabad, Pakistan, 6-year-old Jabro Mounir was arranging bricks this summer — part of his daily work at a brick-making facility. He earns a little less than $2 per day. Muhammed Muheisen/AP hide caption

itoggle caption Muhammed Muheisen/AP