Syrian troops and pro-government gunmen standing on pickup trucks with heavy machine-guns mounted on them, in the eastern city of Deir el-Zour, Syria, Monday, Sept 4, 2017. Syrian government troops and allied forces reached the eastern city of Deir el-Zour Tuesday, breaching a nearly 3-year ISIS siege on government-held areas of the contested city near the Iraqi border. (SANA via AP)

US And Russia Converge On ISIS In Dangerous Showdown

U.S.-backed Syrian rebels are fighting in dangerously close proximity to Syrian forces and their allies, including Russia, in what experts warn is a tinderbox waiting to erupt.