In a media briefing released by Russia's defense ministry, Lt. Gen. Sergey Rudskoy said the Syrian army would reach Manbij, which is currently under control by the PKK/PYD.
Rudskoy also said the Syrian government would administer state affairs in Manbij and the surrounding areas starting from Friday.
Turkey's Defense Minister Fikri Isik told journalists on Friday: "Previously, Daesh left some places to the [Syrian] regime. Now, as we can see, the PYD and the YPG left some places to the regime."
Manbij, an Arab-populated city on the western bank of the Euphrates River, has been controlled by PYD forces, which Turkey regards as a terror group and an offshoot of the PKK which Ankara has been fighting for several decades.
Turkey has insisted PYD elements must leave Manbij and withdraw east of the Euphrates.