SAA cuts off ISIS from "moderate rebels" (who are mostly Al Qaeda here)
https://mideast.liveuamap.com
also:
A day earlier, on July 17, Ilham Ehmed, co-chairperson of the Syrian Democratic Council (SDC), a political wing of the SDF, announced that the SDC will open offices in the provinces of Hama, Homs, Latakia and in the capital of Damascus in the near future in a move allegedly aimed to propel negotiations between the SDF/SDC and the Damascus government.
The announcement came a day after a meeting between US President Donald Trump and Russian President Putin in Helsinki on July 16, during which the discussed the situation in Syria and other important topics.
https://southfront.org/syrian-war-report-july-19-2018-sdfs-political-wing-seeks-to-normalize-relations-with-damascus/
POTUS and Putin probably agreed in to start setting up the peace process between the Russian backed SAA and the USA backed Kurds
leaving only al qaeda jihadists in idlib to be killed (after ISIS is destroyed in the desert near deir ex zoir, and in the Euphrates valley)
then we can GTFO and focus on ending the war in afghanistan