Syria's state media say government forces and their allies are approaching a sprawling rebel-held air base in the northwestern province of Idlib from different directions.
It added that the rebels had used Turkish vehicles.
Russia-backed government forces on Wednesday battled their way into the Abu Duhur military airport as they pressed a weeks-long battle in the last province beyond their control.
France said on Wednesday it was extremely concerned by the government offensive in Idlib, the biggest remaining chunk of Syria still held by anti-government rebels, and demanded that commitments made to reduce hostilities there be respected.
"The operation is to hit the belly of the regime deep into liberated territories and to encircle their advancing forces", said Abdul Hakim al Rahamon, a senior official in Jaish al Nasr, an FSA faction taking part.
Reuben Foster of the SF 49ers arrested in Tuscaloosa
Foster was charged with second-degree marijuana possession in Tuscaloosa , home of his alma mater, the University of Alabama. His urine sample was found to be diluted, which is against the league's drug-testing rules.
Supreme Court says judge Loya's death 'serious issue'
The Congress issued a statement which said observations made by the judges and the issues raised by them are extremely disturbing. In July 2010, the CBI had arrested Amit Shah in connection with the alleged staged killing of Sohrabuddin Sheikh in 2005.
All sailors aboard Iranian burning oil tanker announced dead
The network said rescuers were prevented from entering the crew living quarters by temperatures as high as 192 degrees. The stricken tanker, Sanchi , had drifted into Japan's exclusive economic zone and "suddenly ignited", reports said .
The airport, which straddles the border between the provinces of Idlib and Aleppo, has been under the control of Hayat Tahrir al-Sham since September 2015. "We have killed many".
In May previous year, Russia, Iran and Turkey signed an agreement to set up de-escalation centres in Syria.
Many Syrians living in rebel-held areas see Turkey's military intervention as a bulwark against a relentless bombing campaign by Syrian and Russian airforces they blame for killing and injuring hundreds of civilians in urban areas in recent months, away from the frontlines.
In a statement from the Syrian presidency Thursday, Assad said the "major victories of the army in cooperation with Russian Federation and its other allies... have strengthened efforts for a peaceful solution" to the conflict.
Syrian regime forces faced fierce resistance from jihadists Thursday as they fought to capture a key airbase in Idlib, the last province beyond the government's control, a war monitor said.