Democracy and Class Struggle says that Assad saying that agreement with Syrian Democratic Forces ( Kurdish forces) is best but they can also take Manbij by force is hardly a surprise.
There is communication between Syrian Democratic forces and Syrian Government but there is some dispute as to whether they can be called negotiations.
Democracy and Class Struggle support negotiations as the best strategic options for the Kurds at this juncture.
Assad told RT on May 31, “We started opening doors for negotiations [with the Syrian Democratic Forces (SDF), made up primarily of the YPG] because the majority of them are Syrians — and supposedly they like their country; they don’t like being puppets to any foreigners. That’s what we suppose.”