Yemen's exiled government said on Sunday it would no longer attend UN-mediated peace talks with its Houthi adversaries.
Loyalists of President Abd-Rabbu Mansour Hadi have been battling the Iran-allied militia across the country since late March, when the group forced him and his administration to flee to Saudi Arabia.
A mainly Gulf Arab coalition led by Saudi Arabia intervened in the conflict, mounting hundreds of air strikes on the Houthis and backing ground forces they hope will force the group accept an April UN Security Council resolution calling on them to recognise Hadi and quit Yemen's main cities. The Houthis took control of the capital Sanaa in September 2014.
"(The government) confirmed it would not take part in any meeting until the coup militia recognise international resolution 2216 and accepts to implement it unconditionally," the official state news agency Saba said.
Hailing the now-scuppered talks on Friday, the UN Security Council had urged the parties to refrain from preconditions and "unilateral actions".
Peace talks in June failed to end the fighting, which has brought the country to the brink of famine, killed more than 4,500 people and led to a security vacuum that has strengthened Al Qaeda's Yemen branch.
On Saturday night, a suspected US drone strike killed at least five al Qaeda fighters gathered inside a military base outside the eastern coastal city of Mukalla, local security officials said. The group has partly controlled Mukalla since the army withdrew from the area in April.
A mid-level commander in the organisation, Othman al-Sanaani, was killed in the strike, the sources said.
Al Qaeda in the Arabian Peninsula has carried out attacks against the Yemeni state for years of bomb, plotted to blow up US-bound airliners and claimed responsibility for a January attack in Paris on a French magazine that killed 12 people.