Analysis: Saudi intelligence failure hands Houthis decisive Bab al-Mandab win

The latest:

Houthi fighters advanced this week along Yemen’s Red Sea coast and took islands at the entrance to Bab al-Mandab, a strait vital to global oil flows, Reuters reported. Western, regional and Yemeni officials described the breakthrough as the most serious blow to Saudi Arabia in Yemen in years, exposing intelligence gaps and the collapse of its local allies.

Details:

• The buildup: A diplomat told Reuters the Houthis had quietly massed around 100,000 fighters, vastly outnumbering opposing forces. He said everyone, the Saudis included, failed to notice the mobilisation and misjudged Houthi intentions.
• The assessment: Neil Quilliam of Chatham House in London called the offensive a glaring intelligence failure, saying the signals and indicators were simply not being picked up. Yemeni analyst Farea al-Muslimi said the Saudis were caught by surprise by what unfolded.
• Why it broke: Officials and sources cited deep divisions among anti-Houthi Yemeni factions, an untested Saudi-led command structure that replaced Emirati oversight, and limited Saudi air support, alongside an underestimation of Houthi preparations.
• The windfall: The collapse of Saudi-backed forces left behind a large stock of advanced US- and Saudi-supplied weapons. Regional sources said the haul is likely to boost Houthi capabilities and yield intelligence on their opponents’ equipment.
• The collapse: Emirati analyst Abdulkhaleq Abdulla said Yemeni government forces were “like a house of cards” and did not resist at all.
• Washington’s limits: Two Western officials said the United States and European states are not prepared to provide direct military support. Washington and its allies have not even joined a Saudi-led maritime defence coalition announced in July.
• Riyadh’s search: Crown Prince Mohammed bin Salman travelled to Cairo seeking help after Washington declined to intervene, two regional sources said. Riyadh wants Egypt to take a role in Red Sea operations, recalling Cairo’s 2015 naval and air involvement in securing Bab al-Mandab.
• Houthi demands: Former US negotiator Dennis Ross said the group wants Riyadh to lift restrictions on Hodeidah port and Sanaa airport, pay war reparations, and scale back support for the internationally recognised government. He doubted the Saudis could easily comply.
• The narrowing options: A Gulf official said letting the Houthis consolidate risks turning tactical wins into permanent strategic leverage, while a broader military response could trigger attacks deep inside the kingdom. Saudi officials did not respond to requests for comment.
• The map: Control of land around Bab al-Mandab, between Yemen, Djibouti and Eritrea, extends Houthi regional reach and brings the Horn of Africa closer to their logistics and smuggling networks.

Background:

Mohammed bin Salman’s foreign policy of stabilising the region through de-escalation with Iran has unravelled since the US-Iranian war erupted, while his economic transformation agenda faces mounting pressure.

Between the lines:

Reuters reported that some analysts see the sharper blow not in the battlefield losses but in Washington’s refusal to help, a signal they say emboldened adversaries and deepened doubts about US security guarantees. With Tehran’s allies setback in Gaza, Syria and Lebanon, the breakthrough restores Iranian momentum and gives Tehran and its partners influence over two critical waterways, alongside Hormuz. Al-Muslimi called it a gain for Iran from every direction.

What’s next

Whether Cairo accepts a Red Sea role is the immediate signal; Egypt’s foreign ministry has not responded on the request. Watch also for any Saudi counter-offensive, and whether Western states join the July maritime coalition.