Saudi Arabia and the United States have agreed to end US refuelling of aircraft from the Saudi-led coalition battling Houthi insurgents in Yemen.
The move ends a divisive aspect of US support to a war that has pushed Yemen to the brink of famine.
It comes at a time when Riyadh, already under scrutiny for civilian deaths in Yemen air strikes, is facing global furore and potential sanctions over the murder of journalist Jamal Khashoggi at its Istanbul consulate on 2 October.
The US and Britain late last month called for a ceasefire in Yemen to support UN-led efforts to end the nearly four-year long war that has killed more than 10,000 people and triggered the world's most urgent humanitarian crisis.
"Recently, the Kingdom and the Coalition increased its capability to independently conduct inflight refuelling in Yemen. As a result, in consultation with the United States, the Coalition has requested the cessation of inflight refuelling support for its operations in Yemen," it said in a statement.
Saudi Arabia has a fleet of 23 planes for refuelling operations, including six Airbus 330 MRTT used for Yemen, while the United Arab Emirates has six of the Airbus planes, Saudi-owned Al Arabiya al-Hadath channel reported.
Riyadh also has nine KC-130 Hercules aircraft that can be used, it added.
US Defense Secretary Jim Mattis said the US government was consulted on the decision and that Washington supported the move while continuing to work with the alliance to minimise civilian casualties and expand humanitarian efforts.
Any co-ordinated decision by Washington and Riyadh could be an attempt to forestall action threatened in Congress next week by lawmakers over refuelling operations.
However, a halt to refuelling could have little practical effect on the conflict, seen as a proxy war between Saudi Arabia and Iran.
Only a fifth of coalition aircraft require in-air refuelling from the United States, US officials said.
The alliance led by Saudi Arabia and the UAE has recently stepped up military operations against the Iranian-aligned Houthi movement, including in the main port city of Hodeidah, which is a lifeline for millions of Yemenis.
"The continued escalation of attacks ... by the US-Saudi-Emirati coalition confirms that the American calls for a cease-fire are nothing but empty talk," Mohammed Alial-Houthi, head of the group's supreme revolutionary committee, wrote in a column published by the Washington Post yesterday.
He said the ceasefire call was an attempt "to save face after the humiliation" caused by the murder of Mr Khashoggi, a critic of Saudi policy, that has strained Riyadh's relationship with the West.
Hodeidah has become a key battleground in the war in which the coalition intervened in 2015 to restore the internationally recognised government ousted by the Houthis.
UN bodies warn that an all-out attack on the Red Sea port, an entry point for 80% of Yemen's food imports and aid relief, could trigger a famine in the impoverished country.
The World Food Programme said on Thursday it planned to double food assistance for Yemen, aiming to reach up to 14 million people "to avert mass starvation".
Air strikes by the coalition, which relies on Western arms and intelligence, have often hit schools, hospitals and markets, killing thousands of Yemeni civilians.
UN special envoy Martin Griffiths hopes to convene Yemen's warring parties for peace talks by the end of the year.
The coalition expressed hope in its statement that his efforts would lead to a negotiated settlement, including an end to Houthi missile attacks that have targeted Saudi cities and vessels off the port of Hodeidah.
Mr Mattis said all parties support Griffiths' efforts.
"The US and the Coalition are planning to collaborate on building up legitimate Yemeni forces to defend the Yemeni people, secure their country's borders, and contribute to counter Al Qaeda and ISIS efforts in Yemen and the region," he said in a statement.
The last round of peace talks in Geneva in September collapsed when the Houthis failed to show up, saying their delegation had been prevented from travelling.
The Yemeni government blamed the group for trying to sabotage the talks.