The rival sides in Libya resumed U.N.-sponsored talks in Egypt's capital Cairo on Sunday, as they try to agree on constitutional amendments for the delayed elections.

Twelve lawmakers from Libya’s east-based parliament and 11 from the High Council of State, an advisory body from western Libya, were attending the Cairo-hosted talks, said Abdullah Bliheg, the parliament’s spokesperson.

Bliheg did not offer further details. The United Nations mission in Libya also said talks had resumed in a Cairo hotel.

The first round of the talks, also held in Cairo last month, did not achieve a breakthrough in the dispute over the election's legal basis, which was among the major challenges that caused planned national elections to fail in December.

The failure to hold the vote was a major blow to international efforts to end a decade of chaos in Libya. It has opened a new chapter in its long-running political impasse, with rival governments claiming power after tentative steps toward unity in the past year.

The oil-rich country has been wracked by conflict since the NATO-backed uprising toppled and killed longtime dictator Moammar Gadhafi in 2011. The country has for years been split between rival administrations in the east and west, each supported by different militias and foreign governments.

In February, the country’s east-based, pro-putschist Gen. Khalifa Haftar House of Representatives named a new prime minister, former Interior Minister Fathi Bashagha, to lead a new interim government.

The lawmakers claimed the mandate of interim Prime Minister Abdul Hamid Dbeibah, who is based in Tripoli, expired when the election failed to take place as planned in December.

Dbeibah, however, remained defiant against replacing his government, insisting that he will hand over power only to an elected administration.

Bashagha has yet to be seated in the capital, and calls were mounting to have his government seated in the crucial city of Sirte, which is controlled by forces of his rival-turned-ally Haftar. The city serves as a link between Libya’s eastern and western regions.

The standoff worsened in the past weeks with occasional infighting between rouge militias, especially in the western region, and a partial oil blockade amid a global energy crisis because of the Russian war in Ukraine.

The closure of oil facilities, including Libya’s largest oil field, in areas controlled by Haftar’s forces, was likely meant to deprive Debeibah’s government of funds and embower its rivals.

Libya’s prized light crude has long featured in the country’s civil war, with rival militias and foreign powers jostling for control of Africa’s largest oil reserves.

Bashagha and his ally, the influential Parliament Speaker Aguila Saleh announced earlier this month the oil facilities would be reopened on the condition that oil revenues will be temporarily frozen until rival factions agree on a mechanism to manage such oil funds.

The proposal has enjoyed the support of the United States Embassy in Libya, saying that such a mechanism "should incorporate agreement on priority expenditures, transparency measures and steps to ensure oversight and accountability."