Syria's army and allies, backed by Russian air strikes, recaptured 18 villages from Islamic State fighters in eastern Aleppo province on Saturday, a monitoring group said.
The advance extended their control of parts of a road running towards the jihadist group's stronghold of Raqqa, and built on gains made in assaults that intensified sharply earlier this month.
Damascus's offensive, drawing heavily on Russian air cover and ground support from Lebanese Hezbollah and Iranian fighters, has brought the Syrian army to within 25 km of Turkey's border.
The British-based Syrian Observatory for Human Rights said Syria's army and allied fighters recaptured 18 villages east of Aleppo, bringing under their control some 40 kmof a highway that leads from the city to Raqqa.