Houses are seen in Sawani frontline in Tripoli, Libya, on Feb. 12, 2020. The eastern-based army in Libya has been leading a military campaign in and around the capital Tripoli since April 2019, attempting to take over the city and topple the rival UN-backed government. (Photo by Amru Salahuddien/Xinhua)

The UN Security Council on Wednesday adopted a resolution calling for a "lasting cease-fire" in war-torn Libya, where a fragile truce has been in place since January.

The text, drafted by Britain, was approved by 14 votes out of 15, with Russia abstaining.

It was subject to weeks of wrangling, reflecting deep international divisions over Libya despite world leaders recently agreeing to end all foreign interference in the country and to uphold a weapons embargo.

The resolution affirmed "the need for a lasting ceasefire in Libya at the earliest opportunity, without pre-conditions."

It also expressed "concern over the growing involvement of mercenaries in Libya."

Russia had pushed to replace the word "mercenaries" with "foreign terrorist fighters," but was unsuccessful.

Libya, Africa's most oil-rich nation, has been mired in chaos since the 2011 NATO-backed uprising that toppled and killed longtime leader Muammar Gaddafi.

Since April 2019, the UN-recognized Government of National Accord (GNA) has fought back against an offensive by military commander Khalifa Haftar, who is supported by Russia, Egypt and the United Arab Emirates.

A fragile cease-fire was established on January 12 and at an international summit in Berlin a week later, world leaders agreed to end all foreign interference in Libya and to uphold a weapons embargo.

But there are still near-daily clashes near Tripoli and arms continue to flow into the country.

Moscow is accused of sending several thousand mercenaries from the private Russian security company Wagner to support Haftar, who controls much of the south and east of Libya. Russia denies any involvement.

During negotiations, the United States demanded the Wagner group be clearly identified in the text, diplomats told AFP, before accepting the sole mention of "mercenaries."

The deputy US ambassador to the UN, Cherith Norman Chalet, lamented after the vote that the Council was not united.  "It's also very unfortunate that foreign mercenaries, including from the Kremlin-linked Wagner group, are making an inclusive political solution harder to achieve," she said.

Russia's UN ambassador, Vasily Nebenzia, said his country abstained because of doubts in Moscow about the possibility of enforcing the resolution when the warring parties had not yet agreed to the terms of the ceasefire.

The resolution called for continued negotiations by the joint military commission set up in January between the two sides, with the goal of achieving a "permanent cease-fire." 

This would include a monitoring system, a separation of forces and confidence-building measures. The commission's Geneva meeting ended Saturday without a resolution, but the UN proposed resuming talks from February 18.