Rival forces in Libya have failed to begin withdrawing as required under an October ceasefire agreement aimed at ending years of conflict following Moamer Kadhafi's 2011 killing, a UN envoy said Thursday.

Last month's ceasefire formally ended fighting between forces of the UN-recognized Government of National Accord based in Tripoli and those of eastern strongman Khalifa Haftar.

Following the ceasefire deal, recent developments on parallel economic and political tracks have raised hopes for progress in the North African country.

But Stephanie Williams, UN acting special envoy for Libya, told the United Nations Security Council that "while the joint military commission seeks to operationalize the ceasefire agreement, the two sides have not yet begun to withdraw their forces."

The October 23 agreement says all military units and armed groups must withdraw from the frontlines while mercenaries and foreign fighters must leave Libyan territory within 90 days.

During the video conference, Britain, Germany, Belgium and France in particular called for the fulfillment of military commitments and the departure of foreign mercenaries.

Britain raised the possibility of sanctions for those who do not respect the October agreement.

Haftar, supported by Russia, the UAE and Egypt, launched an offensive on Tripoli in April 2019 but was pushed back early this year as pro-GNA forces received crucial support from Turkey.

Tripoli is held by the GNA, while a parliament based in the eastern city of Tobruk is backed by Haftar's forces.

Cars drive near shell-pocked buildings in Libya's eastern coastal city of Benghazi on October 23, 2020, after a ceasefire agreement was signed between the country's warring factions
Cars drive near shell-pocked buildings in Libya's eastern coastal city of Benghazi on October 23, 2020, after a ceasefire agreement was signed between the country's warring factions AFP / Abdullah DOMA

Libya has been wracked by conflict for nearly a decade, since the overthrow and killing of dictator Kadhafi in a NATO-backed uprising in 2011.

Since then, it has been dominated by armed groups, riven by local conflicts and divided between the two bitterly opposed adminstrations.

Williams said National Accord forces remained stationed at Abu Grein and al-Washkah "with patrolling activities reportedly taking place."

"Military cargo flights were monitored at al-Watiya and Misrata airports," she said.

Haftar's forces "and auxiliaries continued to set up fortifications and military outposts equipped with air defence systems between Sirte and al-Jufra, and in the northern area of al-Jufra airbase."

"Intense cargo aircraft activity was monitored between Benina airport, al-Jufra and al-Gardabiya airbase," Williams said.

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