A file picture shows damaged buildings in the Syrian town of Mayadeen where Russian fighters were among dozens of pro-regime forces killed this weekA file picture shows damaged buildings in the Syrian town of Mayadeen where Russian fighters were among dozens of pro-regime forces killed this week (AFP Photo/STRINGER)
Beirut (AFP) - Russian fighters were among dozens of pro-government forces killed in eastern Syria this week in a deadly wave of attacks by Islamic State group jihadists, Moscow and a monitor said Sunday.
After the collapse of its so-called "caliphate" last year, IS now only holds tiny pockets of Syria, mainly in the vast desert stretching to its eastern border.
This week, the jihadists ramped up their hit-and-run attacks on regime positions there, according to the Syrian Observatory for Human Rights war monitor.
The deadliest was on Wednesday, when IS targeted a group of Syrian and allied Russian fighters near the town of Mayadeen in the eastern province of Deir Ezzor.
"There were 35 pro-government forces killed, including at least nine Russians. Some of those Russian nationals were government troops, but not all of them," said Observatory head Rami Abdel Rahman.
The remaining 26 were all Syrian forces, he told AFP.
A steadfast ally of President Bashar al-Assad, Moscow has helped his army recapture swathes of territory since 2015 by providing air strikes and ground troops.
There are also widespread reports of private Russian mercenaries on the ground.
Moscow's defence ministry said Sunday four of its servicemen were killed in clashes in Deir Ezzor.
Two were military advisers supporting Syrian artillery operations and died immediately, and another two died of their wounds in a Russian-operated military hospital in Syria.
Three others were wounded.
- IS claims attack -
Russia did not specify when, where, or whether IS was involved, but it appeared to be the same incident as the IS attack reported near Mayadeen.
The jihadist group itself claimed it attacked regime forces in eastern Syria on Wednesday.
The assault was the largest in series of IS guerilla raids on regime positions this week.
On Tuesday, 26 regime forces were killed in a surprise IS attack in desert areas of the neighbouring province of Homs, according to the Observatory.
And a pair of IS assaults between Saturday night and Sunday morning killed at least 11 pro-regime forces in Deir Ezzor.
"The latest attack brings to 76 the number of Syrian troops and allied Iranian and Russian forces killed since the escalation," Abdel Rahman said Sunday.
He said the uptick came the day after the last IS fighters were bussed out of southern parts of Syria's capital Damascus, including the ravaged Palestinian camp of Yarmuk, in a negotiated withdrawal.
Many headed towards the Badiya, the stretch of Syrian desert extending from Homs province through Deir Ezzor to the eastern border with Iraq.
The Observatory said the evacuated fighters were actively involved in the recent attacks.
"IS is trying to take the initiative and show it can still threaten the regime and its allies despite the losses it suffered in other areas," said Abdel Rahman.
Government positions in the Badiya make for an easy target: they are few and far between, so reinforcements take a long time to arrive.
- 'Hinder' army -
Russian-backed Syrian troops hold the western half of Deir Ezzor province, which is divided diagonally by the Euphrates River. US-backed fighters hold the east bank.
The river is meant to serve as a de-confliction line to prevent the two sides from clashing as they pursue separate assaults against IS.
A Syrian military source based in the east told AFP that Assad's troops had cleared large parts of territory from IS, which was now lashing out.
"Daesh wants to hinder the army's combing operations in the Badiya by waging these intermittent attacks," said the source, using the Arabic acronym for IS.
It confirmed Russian military advisers were present during Wednesday's attack and were among those killed.
Russia's government officially acknowledges that 92 soldiers have been killed in Syria, although some estimate the number is even higher.
The highest casualties were in March, when a transport plane crashed at Hmeimim airbase where Moscow's airforce is based, killing all 39 people on board.
On Sunday, a local Russian newspaper in the Siberian city of Chita reported on the funerals of four soldiers it said were killed in Syria on May 23.
The international group Conflict Intelligence Team said up to six Russian soldiers could have been killed in the attack, quoting social media reports of a funeral for a Russian soldier that took place in the Western Russian city of Smolensk this week.