The advance, which he said marked their biggest gains in the area since late August, brought them within 2 km (just over a mile) of a government-held industrial zone on the northern edge of Aleppo, the largest city in north Syria.
Russian jets and warships have been bombarding targets across Syria for 10 days in a campaign which Moscow says is aimed at the Islamic State fighters who control large parts of north and east Syria, as well as swathes of neighbouring Iraq.
But many Russian strikes have taken place in areas of western Syria held by other insurgent groups, and Western leaders have accused Russia of intervening primarily to support President Bashar al-Assad.
Abdulrahman said he believed only 10 percent of the Russian strikes had hit Islamic State targets.
Supported by the Russian air campaign, Syrian troops and allied militias have launched an offensive against rebels in the Ghab Plain and other parts of the northern province of Hama, where Abdulrahman said clashes continued late into Thursday night.
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