FILE - In this Dec. 12, 2017, file photo, Russian President Vladimir Putin addresses the troops at the Hemeimeem air base in Syria. When the presidents of Russia, Turkey and Iran meet in Tehran 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. (Mikhail Klimentyev/Pool Photo via AP, File)
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