Iran and Saudi Arabia were already in opposing camps regarding a solution to Syria's civil war. A UN envoy is trying to keep the process on track.
Iran is moving faster than expected, the US says, raising the possibility of sanctions relief in January. But hard-line rhetoric persists on both sides.
Russia’s intervention into Syria has been described as a “game changer.” The conflict has attracted a kaleidoscope of local, regional, and international players all vying to prevail. Here's a guide to who’s who.
Under Sheikh Nasrallah, Hezbollah rode to the defense of its ally Syria. But the Shiite group that was founded to confront Israel is paying a high price in lives and prestige.