FILE - This file photo provided Sunday, Oct. 8, 2017 by the Syrian Civil Defense White Helmets, which has been authenticated based on its contents and other AP reporting, shows Civil Defense workers and Syrian citizens gathering after an airstrike hit a market in Maaret al-Numan in southern Idlib, Syria. When the presidents of Russia, Turkey and Iran meet in Tehran on Friday, Sept. 7, all eyes will be on their diplomacy averting a bloodbath in Idlib, Syria's crowded northwestern province and last opposition stronghold. The three leaders whose nations are all under U.S. sanctions have an interest in working together, but Idlib is complicated and they have little common ground. (Syrian Civil Defense White Helmets via AP, File)
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