
In coming months, the Islamic State will lose its strongholds of Mosul and Raqqa in Iraq and Syria. Yet evicting the group from these cities alone will not be sufficient in stopping future attacks or deterring its military capabilities since the self-proclaimed caliphate will still govern a wide swathe of key Syrian territory. The international coalition must prioritise retaking this land if it hopes to defeat the Islamic State once and for all.
After Raqqa’s fall, the Islamic State will retreat to Syria’s vast and overlooked Deir Ezzor province where it is already well entrenched. This arid stretch of eastern Syria straddling the Euphrates river valley has so far failed to get the attention from policymakers it deserves.