Western-backed Syrian rebels on Tuesday suffered one of their most significant defeats since Russia's military intervention in Syria turned the tide of the war in favor of President Bashar al-Assad, further complicating prospects for a negotiated settlement at peace talks scheduled later this week in Geneva. After a month-long offensive backed by Russian warplanes, government forces and allied Âmilitias reclaimed control of the town of Sheikh Miskeen, strategically located at a crossroads commanding a southern supply route between the Jordanian border and the Syrian capital, Damascus. It was the latest in a string of defeats inflicted on rebel fighters in...