US vows investigation into Syria attack involving Russians

US Defense Secretary Jim Mattis vowed to investigate an attack involving Russian citizens on American-allied forces in Syria but stopped short of accusing Moscow of orchestrating the assault.
Russia has acknowledged that five of its citizens were killed in a US-led coalition bombing in the eastern Deir Ezzor province after they were part of a group pro-regime combatants which led an attack on positions held by the Syrian Democratic Forces.
"I understand that the Russian government now is saying that some of their not-military forces, contractors, were involved in that still unexplained attack," Mattis said while flying back to Washington after a weeklong tour of Europe.

"But they took directions from someone. Was it local directions? Was is from external sources? Dont ask me, I dont know. But I doubt that 250 to 300 people, all just excited on their individual self, suddenly crossed the river in enemy territory, started shelling a location and maneuvering tanks against it.
"So, whatever happened, well try to figure it out. Well work with obviously anyone who can answer that question."
At the time of the attack on February 7, the Russian defence ministry insisted it had no servicemen in the eastern province of Syria.
However, many Russian citizens are fighting in Syria as mercenaries working for a private military company called Wagner according to numerous reports.

Mercenaries not directly affiliated with the Russian military may be convenient for Moscows interests in Syria while assuring deniability of government involvement.