Ukraine's president Petro Poroshenko speaks at a meeting of the National Security and Defense Council (NSDC) of Ukraine on Sunday. Mykola Lazarenko/ITAR-TASS/Landov hide caption

itoggle caption Mykola Lazarenko/ITAR-TASS/Landov

Protester chant slogans in downtown Cairo, Egypt, on Sunday to mark the fourth anniversary of of the 2011 uprising that toppled President Hosni Mubarak. Several people have been killed in clashes with security forces. Hassan Mohamed/AP hide caption

itoggle caption Hassan Mohamed/AP

An official stands in front of relief materials at a camp for displaced people in Maiduguri in Borno State last week. The town, where many have gathered after fleeing Boko Haram attacks, is now said to be under assault from the Islamist extremist group. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Father Najeeb Michaeel shows off one of the many Christian manuscripts he saved from Iraq's Christian libraries. Alice Fordham/NPR hide caption

itoggle caption Alice Fordham/NPR

Allison Begalman, a student at the University of Southern California, wears goggles and headphones to experience a virtual mortar strike on civilians in Aleppo, Syria. James Delahoussaye/NPR hide caption

itoggle caption James Delahoussaye/NPR