
UN Special Envoy for Syria Staffan de Mistura speaks to the media in Astana, Kazakhstan on May 4, 2017. Russia, Iran and Turkey signed a memorandum on the creation of four safe zones in war-torn Syria here on Thursday. (Xinhua/Ospanov)

UN Special Envoy for Syria Staffan de Mistura speaks to the media in Astana, Kazakhstan on May 4, 2017. Russia, Iran and Turkey signed a memorandum on the creation of four safe zones in war-torn Syria here on Thursday. (Xinhua/Ospanov)