Officially, Syrian President Bashar al-Assad’s government and his Russian allies are at war against the Islamic State.
Foreign Policy: Why are Russian engineers working at an Islamic State-controlled gas plant in Syria?
A file image grab taken from a propaganda video released on July 5, 2014 by al-Furqan Media allegedly shows the leader of the Islamic State (IS) jihadist group, Abu Bakr al-Baghdadi.