The Syrian Army, with assistance from Russian and Iranian armed forces, today broke the two-year siege of the last substantial city controlled by ISIS in Syria, Deir ez-Zor on the Euphrates.
Update 5 September 2017: You heard it here first. As illustrated by this selfie, the forces of besieged and relieving units fraternized and celebrated the event.
Update 7 September 2017: Robert Fisk sees this victory of the Syrian army as putting the end of the war in Syria within reach.
Update 22 September 2017: Russian television takes a victory lap.