French President Francois Hollande will become the first Western leader to sit in on the Sunni-dominated Gulf Cooperation Council meeting, which is also expected to air concerns over a potential final nuclear deal with Shiite Iran.
The Riyadh summit brings together leaders from Bahrain, Kuwait, Oman, Qatar, Saudi Arabia and the United Arab Emirates.
All but Oman are in the Saudi-led coalition that launched air strikes in Yemen in late March against Iran-backed Huthi rebels and their allies who seized control of large parts of the country including the capital Sanaa.
Anti-government forces have refused to concede territory or lay down their weapons despite international pressure.
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The United Nations says at least 1,200 people have been killed in Yemen since March 19, and has repeatedly warned that the already impoverished Arabian Peninsula state faces a major humanitarian crisis.
French aid group Action Against Hunger on Monday urged Hollande to push for a ceasefire, while Saudi Arabia said it is considering temporary halts in coalition air strikes to allow aid deliveries.
The French president's trip comes as Paris strengthens its political and economic relations with the oil and gas-rich Gulf monarchies.
The agreement includes an order for 24 Rafale fighter jets, with an option on a further 12.
French Foreign Minister Laurent Fabius today said Paris and Riyadh are also discussing 20 economic projects worth "tens of billions of euros".
Hollande's presence as "guest of honour" at the Gulf summit comes just over a week before the GCC heads of state travel to their traditional ally Washington.
President Barack Obama called that meeting to brainstorm on reducing regional conflicts and in an attempt to allay Gulf fears over any US rapprochement with Iran.
"We are now a major partner of the region," said the official, speaking on condition of anonymity.
Most GCC countries are also part of a US-led coalition waging a campaign of air strikes against the Islamic State group in Iraq and Syria.