ISIS seized the last regime-controlled border crossing between Syria and Iraq with the capture of the al-Tanf crossing on May 22 following a regime withdrawal.
Control of Urban Terrain in Syria
ISIS seized the regime-held town of al-Sukna west of Deir ez-Zour City on May 14, severing the regime’s ground line of communication from Palmyra in the central Homs Desert to Deir ez-Zour City and effectively isolating remaining regime positions in western Deir ez-Zour.
Jennifer Cafarella is the Research Director at the Institute for the Study of War (ISW). She is responsible for setting the organization's research priorities and overseeing their execution by ISW’s team of open source intelligence analysts.