Displaced Sunni Iraqis, who fled the violence in Ramadi, arrive at a makeshift camp on the outskirts of Baghdad, in April. Ahmad Al-Rubaye/AFP/Getty Images hide caption

itoggle caption Ahmad Al-Rubaye/AFP/Getty Images

Police search the area near a destroyed billboard reading "Crimea is Ukraine!" following an explosion in Odessa on June 12. Alexey Kravtsov/AFP/Getty Images hide caption

itoggle caption Alexey Kravtsov/AFP/Getty Images