Yemen's Houthi movement captured the Red Sea port city of Mokha on 10 September as well the island of Mayun at the mouth of the Bab el-Mandeb Strait the following day, the group's biggest territorial gain in years and a direct attempt to replicate Iran's chokehold on the Strait of Hormuz at a second, equally vital waterway. Roughly 12% of world trade passes through Bab el-Mandeb in peacetime. Saudi Arabia, which had already been rerouting oil away from Hormuz through the Red Sea, is now watching its second escape route close as well.
The Houthis' own messaging is doing real strategic work, and it deserves to be read carefully. Their political bureau has been explicit: "maritime navigation is safe for all companies except for Saudi vessels." This is not incidental phrasing. Blockading all shipping through a strait carrying over a tenth of global trade would undoubtably unify the entire international shipping industry and every major economy against the Houthis instantly. Targeting one flag, framed as retaliation for a Saudi blockade on Houthi-held territory, keeps most of the world's shipping and insurance capacity uninvolved, and keeps the story a Saudi-Houthi conflict rather than a global trade crisis. This distinction reflects the whole strategy.
Saudi Arabia's own response has compounded its exposure rather than only defending against it. Satellite imagery showed smoke near the kingdom's East-West Pipeline, its primary alternative route for moving oil away from the Strait of Hormuz entirely, after a Houthi strike, forcing Saudi crude toward an even longer route north through the Suez Canal or an Egyptian pipeline. The Houthis have already shown they'll follow: they struck a Saudi vessel in the northern Red Sea in late August, signalling the "Saudi vessels only" targeting is not confined to the southern chokepoint.
The UN Security Council's emergency session on 10 September, called by Bahrain and the UK after Houthi strikes wounded 73 civilians inside Saudi Arabia, produced reaffirmed commitments to freedom of navigation and calls for restraint, and little else binding. Pakistan's warning that its defence pact with Saudi Arabia and Turkey "could become operational" if attacks continue is the more consequential signal, a potential third-party military escalation path that doesn't currently exist for the Iran-Israel dimension of this same broader conflict.
What this means in practice
- Shipping, insurance, and energy-logistics firms should treat "Saudi-flagged only" targeting as a current constraint, not a permanent one; the Houthis have already broadened targeting once before, during the Gaza-era blockade, when vessels with no connection to that conflict were also struck.
- War-risk insurance pricing for Red Sea transit needs to account for a chokepoint-denial strategy explicitly designed to avoid triggering a unified international response, which makes it harder to predict than a blanket blockade would be, and arguably more durable as a result.
- Pakistan's defence-pact signal is worth tracking independently of the shipping story; a live trilateral military commitment activating would change the risk calculus for the whole region, not just this strait.