Beirut: Daesh terrorists pushed back government forces advancing on one of the last towns still in their hands in the province of Raqqa, killing more than two dozen soldiers and seizing vehicles, a Syria monitoring group and the terrorist group said.

The Britain-based Syrian Observatory for Human Rights said the early Friday counterattack by Daesh short-circuited a government advance on Maadan, which brought them within only a few kilometres in recent days.

The Russia-backed government forces have been on a multi-pronged offensive, moving toward the Daesh-held territories in Deir Al Zor province in the east from northern, central and southern Syria.

On Friday, the Russian military said its air force is now focusing on supporting the Syrian army’s offensive in Deir Al Zor. Syrian government forces control around half the city and a nearby airbase, both of which are besieged by Daesh.

Col. Gen. Sergei Rudskoi of the military’s General Staff said the Russian two-year campaign backing the Syrian government has allowed President Bashar Al Assad’s forces to quadruple the territory under their control.

At a news conference in Moscow, he said the area under Syrian government control has increased from 19,000 to 78,000 square kilometres since Russia launched its air campaign in September 2015. Russian pilots have flown more than 28,000 missions since the campaign’s launch, he said.

Rudskoi said Syrian government troops are advancing from three directions to encircle Deir Al Zor. “Breaking the blockade of the city will mark the defeat of the most capable part of the IS [Daesh] in Syria,” he said.

The Daesh attack Friday set the government back about 30 kilometres to the west of Maadan and allowed the militants to recapture a number of villages in the areas they lost to advancing government troops last month. Maadan lies halfway between Raqqa city and Deir Al Zor city, which is divided between government- and Daesh-controlled areas.

The Observatory called the Daesh attack its biggest in southeastern Raqqa. It said at least 34 Syrian soldiers and 12 militants were killed.

Daesh media channels posted pictures of the attacked Syrian army convoy and bodies of over a dozen soldiers. Maadan lies along the southern banks of the Euphrates River and is 60 kilometres east of the city of Raqqa, where the US-backed Syrian opposition forces are separately battling Daesh.

The militants have unsuccessfully tried to push back against government advances in central Syrian town of Akerbat. Russian officials said Syrian troops have encircled Daesh terrorists in the town and Gen. Sergei Surovikin, the head of Russia’s military in Syria, said controlling Akerbat would allow the Syrian government to take full control of the oil and gasfields north of Palmyra.