Tribalism and other forces make ending the “caliphate” more complicated than it at first appears.

Turkey has expressed outrage that the U.S. is working with the Syrian Kurds against ISIS.

Turkey’s worries about Russia are again pushing it toward the West, and Israel’s gas reserves are giving the country new regional clout.

Ankara refuses to withdraw troops from northern Iraq.

The U.S.-backed alliance in Syria is still little more than Kurds and on-paper agreements with small Arab forces.

Chairman of the Joint Chiefs unveils new measures on trip to Kurdistan.

Sources suggest chlorine attacks against the Iraqi Army, and potentially more to come.