The offensive on Idlib -- a large province in northwestern Syria packed with civilians and dominated by al- Qaida-linked militants -- was expected after the defeat of the Islamic State group late last year.
Last week, Russia's Foreign Minister Sergey Lavrov said the main military operations against IS in Syria have ended and signaled that the focus would shift to al-Qaida-linked militants.
The Idlib offensive carries significant risks.
Turkey, a supporter of the rebels, has deployed military observers in the province as part of a de-escalation deal with Iran and Russia, but that has not stopped the fighting on the ground or Russian airstrikes against the insurgents.
It is not clear how far the current offensive aims to reach, and recapturing the entire province is expected to be a long and bloody process. Opposition activists say the main target for now appears to be the sprawling rebel-held air base of Abu Zuhour, on the southeastern edge of the province, and securing the Damascus-Aleppo road that cuts through Idlib province.
The offensive gained more intensity on Christmas Day, when one of President Bashar Assad's most trusted and experienced officers took command of the operation to extend the government's presence toward Idlib and boost security for the road that links the capital, Damascus, with Aleppo, Syria's largest city.
Brig Gen Suheil al-Hassan, also known among his troops as "Tiger," has led elite forces to many victories against insurgents since the conflict began nearly seven years ago. He has been credited most recently with the defeat of IS in much of eastern Syria, including the months-long battle for the city of Deir el-Zour.
He said rebels are stuck in a two-front battle with government forces and remaining pockets of Islamic State militants. He said the Russian airstrikes have exacted a heavy toll.
Another opposition activist based in Hama province, Mohammed al-Ali, said the Russians and the Syrian government are "carpet bombing" villages before pushing into them.
"The Russian airstrikes, weak fortifications and Islamic State attacks in Hama" have all helped government forces, he said by telephone.
The province is dominated by the Levant Liberation Committee, which claims to have severed ties with al-Qaida but is widely believed to still be affiliated with it.
Al-Hassan's chief mission for now appears to be securing the Damascus-Aleppo road.
In December 2016, Assad's forces captured rebel-held parts of the city of Aleppo, marking the government's biggest victory since the conflict began. The main road to the capital remained perilous, however, with insurgents attacking it from the west and IS from the east. The troops have since driven IS back, but the western side remains exposed.
Since then, thousands of people have been fleeing with their belongings amid harsh cold weather toward safer areas further north, including Idlib city and areas near the border with Turkey. Pro-opposition media say that more than 5,000 families have fled the violence over the past two weeks, some renting homes or staying in tents in open fields, others left homeless.
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