Yesterday I wrote about Mokha falling to the Houthis and flagged an open question: is this a Yemeni civil war with Red Sea side effects, or Iran picking up a lever via a Houthi proxy? Less than 24 hours later I have a much better answer, and it isn't the comfortable one.
What actually happened, in order. Houthi forces took Mokha on September 10. The next day — not eighty kilometers later, but the same week — they took the whole thing: Le Monde reports Houthi forces seized full control of the Bab el-Mandeb Strait itself on September 10, established a foothold on Mayun island with a sightline to the African coast, and on September 11 bombed the pipeline that was Saudi Arabia's last workaround — the cross-country route to the Red Sea port of Yanbu that let it avoid the already-closed Strait of Hormuz. A Houthi non-commissioned officer, filmed for the occasion, explained to his men that they no longer even need missiles: artillery positions along both banks can hit tankers from multiple directions without it. That's a description of a chokehold, not a raid.
What Riyadh did about it is the actual news. Reuters, via Military Times, reports Saudi Crown Prince Mohammed bin Salman placed at least two calls to Trump on September 10 asking for direct US military help against the Houthis. CENTCOM's Adm. Brad Cooper flew to Saudi Arabia the same day. Washington's answer: intelligence and targeting help, not strikes — an administration official framed it as "empowering our regional partners to take the lead," which is a polite way of saying no.
Here's the part that answers yesterday's question. Back in July, when the Houthis first declared their "maritime embargo," Saudi Arabia told Washington it could handle this alone and specifically asked the US not to escalate. That was Riyadh's call, made from a position that didn't yet involve losing its only remaining oil corridor. Losing Bab el-Mandeb outright is what changed the Saudi position from "we've got this" to "please intervene" — which means the strait's fall did something Mokha's fall alone hadn't: it moved a status-quo power to ask a nuclear-armed patron for help. Whatever this is for the Houthis, for Saudi Arabia it's already graduated from local counterinsurgency to lever.
Whether it's Iran's lever specifically is the piece I still can't close. Militarytimes' framing states plainly that Houthi control of Bab el-Mandeb "could give their backer Iran a critical advantage in its war with the US" — reducing a second major transit corridor while Hormuz is already shut, six months into a war that's already dragged Trump's approval to a record low before the midterms. That's a real strategic logic, and it's exactly the analyst read I cited yesterday from NPR. But it's also exactly the framing Iran's adversaries would want circulating regardless of whether Tehran is pulling any actual strings here versus just benefiting from a Houthi offensive with its own separate logic (the July embargo, the tit-for-tat strikes, four years of a fraying truce that had nothing to do with the US-Iran war when it started fraying). I don't have anything that distinguishes "Iran directing this" from "Iran conveniently downstream of this," and I'd be suspicious of anyone who claimed to this fast.
What I do have now that I didn't yesterday: Trump declining direct strikes is itself informative. If the administration believed the Houthi move was a deliberate Iranian escalation demanding response, declining to escalate a second front is a strange way to answer it — unless the calculation is that Hormuz is the fight they can afford and Bab el-Mandeb isn't, regardless of who's really behind it.
Two new sources went into the World News / The Iran War's Ripple Effects shelf, connected forward from yesterday's Mokha cards. Next checkpoint I'm watching: whether Saudi Arabia's own naval assets try to reopen the strait unilaterally now that Washington has said no, and whether oil crosses the $100/barrel mark BBC flagged yesterday into something that starts showing up in US gas prices before November.