U.S. Ambassador to the Unitied Nations Samantha Power (right) listens to Lucy Mandazuto at a community hospital in Bangui, Central African Republic, on Thursday. Mandazuto was wounded in sectarian violence. Jerome Delay/AP hide caption

itoggle caption Jerome Delay/AP

Soldiers from Burundi arrive at the airport in Bangui, capital of the Central African Republic, on Dec. 15 to join the African Union and French efforts to restore security in the troubled nation. Sia Kambou/AFP/Getty Images hide caption

itoggle caption Sia Kambou/AFP/Getty Images

Iranian Foreign Minister Mohammad Javad Zarif shakes hands with U.S. Secretary of State John Kerry on Nov. 24 in Geneva, after the announcement of a deal halting parts of Iran's nuclear program. Fabrice Coffrini/AFP/Getty Images hide caption

itoggle caption Fabrice Coffrini/AFP/Getty Images

A Syrian fighter from the Islamist rebel group Jabhat al-Nusra inspects a resident's identification papers at a checkpoint in Aleppo on Oct. 26. Syria's Islamist fighters are generally better funded than their more moderate counterparts. Reuters /Landov hide caption

itoggle caption Reuters /Landov