Russian warplanes launched at least 15 air strikes to support government troops as they began a new operation just north of the city of Homs, a monitoring group said.
Syrian state television, citing a military source, said the army had begun a military operation in the north and northwest of Homs province "with the goal of restoring security and stability to the villages and towns in the area".
It said its forces had taken control of one village north of the city.
The Homs offensive is the latest joint operation between Syrian ground forces and Russian warplanes since Moscow began an aerial campaign on September 30.
The latest fighting appears intended to secure the main highway that leads from Homs to neighbouring Hama's provincial capital Hama city.
The two cities are fully or almost-fully controlled by the Syrian government, but opposition forces including moderates, Islamists and Al-Qaeda affiliate Al-Nusra Front, control territory in between.
Syrian troops have in recent days also been pushing a military operation in northern Hama province and the Sahl al-Ghab region between Hama, Latakia and Idlib provinces.
Today, Syrian state television said its forces had seized two small villages in northern Hama, extending their push towards Idlib, which is controlled by a rebel alliance known as the Army of Conquest.
The advances have come with the support of a Russian air campaign that Moscow says is targeting the Islamic State group and others it describes as "terrorists".
Russia's entry into the conflict has raised fears of a potential confrontation with the US-led coalition that began air strikes against IS in Syria and Iraq more than a year ago.
