As a result of an air strike more than 60 foreign mercenaries from the former Soviet Union, Tunisia, and Egypt were killed south of Deir Ezzor.
A separate strike near the city of Mayadin killed up to 80 terrorists, among them nine fighters from the northern Caucasus, and destroyed a command center, 18 SUVs, and three ammunition depots.
Russian-backed Syrian regime forces today broke into the eastern town of Mayadeen, one of the Islamic State group's last bastions in the country, a monitor said.
"According to information received via several channels and confirmed "on the ground", influential Daesh field commanders, natives of the North Caucasus: Abu Omar al-Shishani, Alyauddin Al-Shishani and Salahuddin al-Shishani, who were hiding in Iraq for a long time, were destroyed", Konashenkov said. "Instead of the New Syrian Army, mobile ISIL (former name of IS - TASS) groups, like a jack in the box, carry out sabotage and terrorist attacks against Syrian troops and civilians from there", he said.
The most recent charge against Russian Federation came a day earlier when the Britain-based Human Rights' Observatory Group accused its forces of killing 14 civilians, including 3 children in an air raid carried out near the Euphrates in Al Mayadeen region.
Abu Dali had been spared much of the violence and had functioned as a local business hub between rebel-run areas and those under President Bashar Assad's forces.
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Elsewhere near the Jordanian border, the Russian military said the United States is using the refugees living in the Rukban desert camp as human shields to protect its military base in the southeastern town of al-Tanf.
The advances against IS in Deir Ezzor have cost a heavy civilian death toll from Russian and coalition air raids.
IS jihadists have controlled Mayadeen in the eastern province of Deir Ezzor since 2014.
Over the course of months of successive defeats, Mayadeen and nearby Albu Kamal on the Iraqi border have taken in IS fighters fleeing the battle to the north for Raqa city in the face of an offensive launched by US-backed Kurdish and Arab forces.
The Syrian military shelled Mayadeen overnight and Syrian and Russian warplanes have conducted hundreds of strikes, it said.