Russia has reportedly flown hundreds of fighters to Libya, most likely via Cham Wings airlines from Damascus to Benghazi. Wagner fighters have reportedly supported Haftar's assault on the Libyan capitol of Tripoli. Their activities overlap between contractors, mercenaries, and other categories - there is no clear separation between military and private like one sees in the west. Last month, it was reported that two other Russian companies, including Moran Security Group, have joined Wagner in supply mercenaries to fight in Libya. Although it is difficult to be definitive about all the African mercenaries, most of them seem to be supporting Haftar.
Source: The North Africa Journal February 06, 2020 21:56 UTC