The Syrian army signaled on Thursday it would press on with operations against Islamic State northeast of Aleppo, in a veiled warning to Turkey which backs a separate military campaign in northern Syria.
Syrian government forces have rapidly driven Islamic State back in the last two weeks, advancing to within 6 km (4 miles) of the city of al-Bab that the jihadists are fighting to hold.
The army's gains risk sparking a confrontation with Turkey, which has sent tanks and warplanes across the border to support Syrian insurgents who are trying to seize al-Bab in a separate offensive.
Turkey's offensive, launched last year, aims to drive both Islamic State and Syrian Kurdish fighters away from its borders, as Turkey sees both groups as a security threat.