Yemen's Iran-backed Huthi rebels are to fly to Riyadh for the first publicly announced visit since a Saudi-led military coalition opened hostilities in 2015, government and diplomatic sources said on Thursday.
The Huthis' visit, expected within the coming days, will raise hopes of a breakthrough in the quagmire conflict that has left hundreds of thousands dead through direct and indirect causes such as famine.
It comes five months after Saudi officials held talks in Sanaa, and as a UN-brokered ceasefire continues to largely hold despite officially lapsing in October.
"There are preparations for a Huthi delegation to visit Riyadh within the next 72 hours," a Yemeni government official familiar with the situation told AFP.
A Western diplomat in Yemen confirmed the visit, saying it could take place on Thursday or within the next two days. Saudi officials did not immediately respond to a request for comment.
Ali al-Qhoom, a member of the Huthis' political council, also announced the visit on X, formerly known as Twitter.
Yemen was plunged into war when the Huthis seized control of the capital Sanaa in September 2014, prompting the Saudi-led intervention the following March.
The ensuing fighting has forced millions from their homes, causing one of the world's worst humanitarian crises in a country already pummelled by decades of conflict and upheaval.
The six-month ceasefire that expired last October is still mostly holding but moves towards peace have been slow since the Saudi delegation visited Sanaa in April.
A delegation from Oman, which plays the role of mediator, arrived in Sanaa on Thursday, Yemeni government officials said -- days after Saudi de facto ruler Crown Prince Mohammed bin Salman met Oman's sultan en route from the G20 summit in India.
- 'Back rooms to the living room' -
Qhoom, from the Huthis' political council, said the rebels' delegation would fly to Saudi Arabia on an Omani plane.
"Optimism exists regarding the mediation and the Omani efforts to achieve peace in Yemen," he posted on X.
The head of the Sanaa Center for Strategic Studies think-tank, Majed al-Madhaji, told AFP that the Huthi visit "is like moving the relationship between the Huthis and Saudi Arabia from the back rooms to the living room".
By organising talks in Riyadh, both sides are "legitimising this relationship and giving it an additional impetus".
"On the political level, it is an advanced step to end Saudi Arabia's direct role in Yemen and for the Huthis to acknowledge its role as a mediator," in addition to being one of the parties to the conflict, he added.
Moves towards peace in Yemen have accelerated since heavyweight regional rivals Saudi Arabia and Iran announced a surprise rapprochement in March, seven years after they broke off ties.
The Huthi demands include payment of their civil servants' salaries by the displaced Yemeni government, and the launch of new destinations from Sanaa airport, which was closed until last year when commercial flights resumed to Jordan and Egypt.
Underlining Yemen's problems, UN agencies and 91 international and Yemeni non-governmental organisations on Thursday said 21.6 million people -- 75 percent of the population -- needed humanitarian assistance, calling for more funding.