Libya's state oil company says that Russian and other foreign mercenaries have moved into a major oilfield, called El Sharara, where it had been planning to restart production.

Most of Libya's oil facilities are located in areas under the control of the eastern-based renegade military General Khalifa Haftar, who is supported by Russia.

But the National Oil Corporation said it rejected any attempt by foreign countries to prevent the resumption of production.

There's been a renewed push to restart peace talks after Gen Haftar's forces were driven back from the capital, Tripoli.