NEW: Blackwater founder Erik Prince's new private security firm (Frontier Services Group) has reportedly sent mercenaries into Libya to fight alongside warlord Khalifa Haftar.

You know who else has sent mercenaries to fight alongside Haftar? Russia.https://t.co/ErL8XKU1mv

— Caroline Orr Bueno, Ph.D (@RVAwonk) April 30, 2019