On Wednesday, Syrian government forces made a major breakthrough in a battle against ISIS on the western bank of the Euphrates southeast of Deir Ezzor.
The Syrian Arab Army (SAA) and its allies liberated the important hills of Um Qddamah and Ard Hamirah and reached Az Zabari deploying in only 6-7km from the key ISIS-held town of al-Mayadin.
Al-Mayadin is one of the key strongholds of the ISIS on this bank of the Euphrates River. If government troops overrun the ISIS defense in the area, they will likely be able to liberate a large chunk of the terroritry of the Euphrates Valley from ISIS then.
Some pro-government sources even speculate that this would allow to cross the Euphreates River near the Omar oil fields.
Meanwhile, reports are appearing that the SAA secured the entire Palmyra-Deir Ezzor highway after repelling another ISIS attack. However, this still has to be confirmed.