FILE - In this Oct. 11, 2017, file photo, former U.S. Ambassador to Iraq James Jeffrey speaks during a hearing on Iran before the House Foreign Affairs Committee at Capitol Hill in Washington. U.S. officials say the Islamic State remains a global threat despite losing the once vast territory it held in Syria and Iraq.  Jeffrey, now the State Department envoy to the international coalition fighting the Islamic State, told reporters that thousands of the extremist organization's fighters are scattered around Syria and Iraq, where officials see a “persistent, resilient, rural terrorist level of violence” in that country. (AP Photo/Jose Luis Magana, File)
James Jeffrey said Russia's air forces had turned the tide of the conflict. AP

Russia has enough influence to get Iran out of Syria, US envoy says