In this April 14, 2016, file photo, a Russian military camp is seen at the ancient city of Palmyra in the central city of Homs, Syria. (AP Photo/Hassan Ammar, File)
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In this April 14, 2016, file photo, a Russian military camp is seen at the ancient city of Palmyra in the central city of Homs, Syria. (AP Photo/Hassan Ammar, File)
