Middle East

Why Turkey Is Fighting the Kurds Who Are Fighting ISIS

On the same day that Turkey announced it would help fight the Islamic State, Turkish forces began an airstrike campaign against one of the very groups that has been crucial to stopping the advance of the Islamic State.

Since the July 24 announcement, Turkey has launched several waves of airstrikes against elements of a Kurdish separatist group known as the P.K.K., which is widely listed as a terrorist group. But that group and its allies in Syria, who have been closely working with American forces, are pushing Islamic State militants out of areas they once controlled.