Another 15 Russian PMC's KIA in Syria

Fifteen Russian private military contracters were killed after an explosion only five days after an uncertain number of Russians were killed in air strikes conducted by the US Air Force. The incident happened in Tabiya Jazira in the northeastern province of Deir Ezzor when they were accompanying fighters of the Al Baqir brigade as they advanced on the oil and gas fields controlled by the SDF. The cause of the explosion is believed te be a booby trap in a arms depot they tried to open.

https://www.theguardian.com/world/2018/feb/15/fifteen-russian-security-staff-killed-in-syria-explosion