Pulling out of Syria: A primer

By GREGORY HELLMAN and CONNOR O’BRIEN 12/20/2018 05:02 PM EST Vehicles of the US-led coalition battling the Islamic State group patrol the town of Rmelane in Syria’s Hasakeh province on June 5. | Delil Souleiman/AFP/Getty Images President Donald Trump’s abrupt announcement that “we have defeated ISIS” in Syria and U.S troops are “all coming back…