UPDATE : Field Marshall Haftar has had meetings with the Russian government , which is considering providing him weapons and possible recognition as Libya's future leader. To do this, Moscow would have to abandon its support of the UN arms embargo and the UN supported GNA government in Tripoli. In return Russia would be seeking influence on Haftar's government. Moscow is only doing in public what the West has been doing surreptitiously.
If the West wishes to prevent Libya becoming a potential "client state" of Russia, it needs to do three things.
1) end all military assistance to Haftar,
2) take military action against Haftar and return the oil ports to the control of the GNA,
and 3) initiate legal steps to have Haftar brought before an International Tribunal for war crimes.
If Haftar were removed. Russia would have no significant supporter in Libya. The GNA as the sole government would not be any friend of Russia.