On this may 27 at his Twitter page, AFP news Agency reported, citing data from the monitoring group, writes the Chronicle.info with reference for Today.
The Russian Defense Ministry says four of its servicemen have lost their lives after foreign-sponsored Takfiri militants launched an attack against an artillery battery of the Syrian army in the country's eastern province of Dayr al-Zawr.
Then killed, in addition to the four soldiers, two employees of a private military company, PMC supposedly "Wagner".
Forty-three rebels also were also killed, the ministry said.
Through surveillance of radio transmissions, the USA discovered that at least some of the pro-government forces were speaking Russian, stoking the fears, according to The Times.
During the nighttime battle, 43 terrorists were killed and six vehicles equipped with large-caliber machine guns were destroyed.
Two Russian military advisers who directed fire from the Syrian battery were killed on the spot.
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President Vladimir Putin deployed the Russian military to Syria in September 2015, in what he called an effort to fight the IS on its own turf.
Russian Federation has been a staunch backer of Syrian President Bashar al-Assad.
Five Russian soldiers were also injured and were promptly taken to the Russian military hospital, it said.
The Syrian troops together with the Russian military from the military advisers' group entered the battle.
The highest casualties were in March, when a transport plane crashed at Hmeimim airbase where Moscow's air force is based, killing all 39 people on board.
According to the Syrian Observatory for Human Rights, the attackers targeted a group of Syrian and Russian soldiers near Mayadeen town in Deir Ezzor province in eastern Syria on Wednesday, May 23, the report added.