Iran Flew In the Weapons. Seven Days Later, the Houthis Blockaded Saudi Arabia — Not Iran's War.

The Houthis suspended their two-year Red Sea campaign on 11 November 2025, tied to the Gaza ceasefire. Recovery was slow even with the shooting stopped: a hundred days later, in the first week of January 2026, Suez Canal traffic remained roughly 60% below its 2023 pre-crisis baseline. By the week ending 19 July 2026, Bab el-Mandeb daily transits had finally climbed to their highest level since December 2023, per Lloyd's List Intelligence. That recovery broke days later. Effective 20 July at 12:00 UTC, the Houthis announced a naval blockade targeting vessels linked to Saudi Arabia, and on 22-23 July claimed missile and drone strikes on the Saudi-flagged tankers Encelia and Layla, with Encelia confirmed struck and on fire (crew reported safe). By 23 July, roughly 23 Saudi-flagged vessels had switched off their AIS transponders to avoid identification, and daily Bab el-Mandeb transits had fallen to 33 against a July average of 40 — a real, if so far partial, reversal of the recovery that had just peaked.

On 13 July 2026 a Mahan Air flight carrying between 10 and 21 IRGC commanders and military advisers, missile- and drone-related equipment, and gold to fund Houthi operations departed Iran for Sanaa. Before it could land, the internationally recognised, Saudi-backed Yemeni government struck Sanaa International Airport; the aircraft diverted to Houthi-controlled Hodeidah. One source told Reuters the commanders travelled 'to support Houthi operations and provide training on new missile systems.' Seven days later, on 20 July, the Houthis declared their blockade, framing it explicitly as 'an eye for an eye' for the airport strike and the wider Saudi-led restrictions on Yemen. That is the Houthis' own stated reasoning, and it is credible on its face — but it was not a sudden rupture: the Atlantic Council's reporting describes 'weeks of escalating rhetoric' and missile exchanges before the declaration, and on 5 July, more than a week before the airport strike, the Houthis killed 16 pro-government troops south of Hodeidah in what one government officer called the deadliest such attack in years. The airport strike is the incident the Houthis named; the ground fighting and rhetoric that preceded it make a single-cause reading hard to sustain, which is why this is scored likely rather than confirmed.

Iran's interest in a Houthi force that can threaten Red Sea shipping is not in dispute — the resupply flight, gold included, is direct evidence of continued investment, resumed within the same week the blockade's trigger occurred. Where the record gets uncertain is causation: Al Jazeera's reporting on the Houthi-Iran relationship found that Iran 'lacks control over Houthi behavior,' that the group 'likely decided to impose their blockade on Saudi Arabia to advance their own interests' even if 'Iran probably encouraged' it for Tehran's own purposes, and — concretely — that the Houthis had already declined an earlier Iranian request that they close Bab el-Mandeb during the US-Iran war, only moving on Saudi Arabia after their own grievance (the airport strike) arrived. That pattern argues for strategic alignment, not command: Iran supplies capability the Houthis then deploy on a timetable and against a target of their own choosing. Both readings leave Iran better off than if the Houthis had no capability at all, which is why 'benefits' is scored uncertain rather than a clean answer either way.

The clearest losers are measurable. Bab el-Mandeb daily transits, which had just reached their best level since December 2023, fell to 33 against a 40-per-day July average within a day of the blockade taking effect, and roughly 23 Saudi-flagged vessels went dark on AIS to avoid identification — a direct cost to the transparency that keeps the strait's insurers pricing risk accurately. Saudi Arabia's Red Sea oil trade, run through the port of Yanbu, is exposed by name in the blockade's own scope. Shipowners who had begun re-routing through Suez after a hundred days of calm face the same choice they faced in 2024: eat a longer, costlier Cape of Good Hope diversion or risk a strait a designated blockade now covers. At the UN, Secretary-General Guterres said he was 'deeply alarmed' by the resumed attacks, and Special Envoy Hans Grundberg voiced similar concern, both calling for immediate de-escalation. None of this run's sources documents casualties from the Encelia or Layla strikes specifically, which is the one piece of good news in an otherwise costly week for the corridor.