In this Friday, Sept. 15, 2017 photo Russian military helicopter flies over a desert in Deir es-Zor province, Syria. A U.S.-backed force in Syria said a Russian airstrike wounded six of its fighters Saturday near the eastern city of Deir el-Zour while in southeast Syria, Syrian troops and their Iran-backed allies began a new offensive aiming to capture areas along the Iraq border under the cover of Russian airstrikes. (AP Photo)
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