The Islamic State group in Syria is about to lose access to Turkey’s porous border, the Pentagon said Thursday, a vital step in blocking foreign fighters from replenishing the jihadists’ thinning ranks.

According to Pentagon spokesman Captain Jeff Davis, ISIS now retains control of only about 25 kilometers (15 miles) of border with Turkey along an area to the east of the small Syrian town of Al-Rai.

“This is the only area with which ISIL has free communication with the outside world, where it touches a border,” Davis said, using an ISIS acronym. […]