The document is meant to prevent possible adverse encounters between American and Russian warplanes over Syria.The ministry said the officials had also discussed "additional measures to prevent conflict situations during joint operations against ISIL and Jabhat Al-Nusra," the two groups designated by the UN as terrorists operating in Syria.Russia, Turkey, and Iran agreed upon the plan to establish four safe zones in Syria during peace talks in Astana, Kazakhstan.
The United Nations welcomed the long discussed safe zones, although they have been rejected by Syrian rebels and the Kurdish PYD.