The Houthis staged an offensive in recent weeks to take over Yemen's entire Red Sea coast, threatening global trade and pushing up energy prices up.
G7 nations have urged Yemen's Houthi rebels to stop strikes on Saudi Arabia, in a show of solidarity with Riyadh as the Tehran-backed fighters add a new threat to the Middle East war.
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The leaders of the G7 nations Canada, France, Germany, Italy, Japan, the United Kingdom and the United States said in a statement: "We call on the Houthis to immediately cease all military actions and all threats and attacks against civilian shipping, and to return to the political process in good faith."
They also called on Iran "to end its arming of and support for the Houthis", alleging that Tehran is in violation of previous UN Security Council resolutions.
Gains made by the Houthis have strengthened Iran and its allies' hold over two key waterways, including the Strait of Hormuz, which the wider Gulf region and top crude exporter Saudi Arabia rely on to ship oil.
The war in Yemen, which began in 2014 with the Houthi capture of the capital Sanaa, had been largely frozen since 2022 but resumed in July.
Saudi Arabia has led a coalition backing the internationally recognised government since 2015. Its intervention escalated the war, which has triggered one of the world's worst humanitarian crises.
Saudi strikes on Yemen's strategic Red Sea port of Mokha killed at least six people and wounded eight others, the Houthi-affiliated news agency Saba reported on Tuesday.
The strikes followed a Houthi attack on Riyadh on Saturday, which marked the first attack on the Saudi capital in years and a major escalation by the Iran-aligned fighters.
Support from the UK and France
Britain's prime minister, Andy Burnham, agreed to provide military support to Saudi Arabia on Monday, adding that the UK would provide "defensive" air-to-air refuelling for Saudi jets.
France also pledged its support, saying it was ready to work on "securing" Saudi energy infrastructure targeted by Iran-backed Houthis, while adopting a "strictly defensive approach," a diplomatic source told the AFP news agency on Monday.
"This in no way involves taking part in the conflict with the Houthis," the source added.
The Houthis have carried out attacks against facilities belonging to Saudi oil giant Aramco in the Red Sea port city of Yanbu. The East-West Pipeline, a crucial crude oil export route, has also been shut down following drone attacks launched from Iraq, according to Riyadh.
The head of Yemen's governing body, Rashad al-Alimi, held a call with US President Donald Trump to request American support against the Iran-aligned fighters, a source in Alimi's office told AFP on Monday.
Trump did not promise military support, the source said, adding that the call, which took place on Sunday, was intended as a show of solidarity with Yemen's embattled government.
Saudi Crown Prince Mohammed bin Salman also urged Trump to strike the Houthis, US media reported.
The New York Times said the crown prince called Trump on Sunday "to implore him, again" to help counter the group's advances, with Axios previously reporting that Trump had rebuffed a similar request last week.
Fox News reported on Sunday that Trump had said the Houthis had agreed not to hit US targets.
Mecca Joint Defence Agreement
The Houthi movement, also known as Ansar Allah (Supporters of God), is named after its late spiritual leader Badreddin al-Houthi and his son Hussein, who was killed by Yemeni government forces in 2004.
Houthi's other son, Abdulmalik, assumed the reins of power, delivering fiery speeches and transforming his group from an isolated faction in the northwest into the ruling power in the capital and a regional player.
In one such speech on Monday Abdulmalik said Saudi had launched 760 airstrikes as of a day earlier questioning "if Pakistan and Turkey were subjected to this number of strikes, wouldn't it cause a major crisis?"
He said Saudi Arabia is seeking to "push the Turks and Pakistanis forward and import Takfiris (the charge of apostacy) from Syria, at a time when Syria is facing total destruction" advising the two countries "not to become entangled for political and financial gain from the Saudi enemy".
Pakistan, Saudi Arabia and Turkey last month signed the so-called Mecca Joint Defence Agreement, committing the three countries to mutual defence in the event of any of them being attacked.
The pact came against a backdrop of war between the United States and Iran and attacks in the region from Tehran-backed Houthi forces.