The United States has accused Russia of deploying jet fighters to Libya in what if confirmed would be a dramatic escalation of its military support for renegade field marshal Khalifa Haftar's war against the country's UN-recognised government. United States Africa Command said on Tuesday it had monitored several jet fighters flying from Russia to Libya via Syria, and that it expected them to be used to support Russian mercenaries fighting on the ground in support of Gen Haftar's Libyan National Army (LNA). "We watched as Russia flew fourth generation jet fighters to Libya - every step of the way. Neither the LNA nor private military companies can arm, operate and sustain these fighters without state support - support they are getting from Russia," US Army Gen Stephen Townsend, the head of Africom, said in a statement. Africom said it had tracked the Russia and that they stopped en-route in Syria, "where it is assessed that they were repainted to camouflage their Russian origin." It did not say exactly how many aircraft were involved, but released several images of what appeared to be Mig-29 Fulcrum and Su-35 Flanker fighters in flight, as well as one Mig-29 being towed on a runway at the al Jufra airbase 300 miles southeast of Tripoli. The Russian ministry of defence did not immediately comment on the claims.