'US in Syria keeps focus on defeating Islamic State'
How the US navigates a complex war that involves Russia, Iran, Turkey, the Syrian regime, rebels and US Kurdish allies.
A Syrian Democratic Forces (SDF) fighter takes a position as smoke rises from the al-Mishlab district at Raqqa's southeastern outskirts, Syria June 7, 2017. (photo credit: REUTERS/RODI SAID)BySETH J. FRANTZMANUpdated: