Iran has asked Yemen's Houthi movement to prepare to shut down the Red Sea oil shipping route if the United States attacks Iranian power infrastructure, according to sources reported in mid-July 2026 (Reuters). The directive would make the Bab al-Mandeb Strait — the narrow waterway between Yemen and Djibouti that connects the Red Sea to the Gulf of Aden — a retaliatory tool in any future US-Iran military confrontation, pushing the Houthis' role beyond Yemen's borders into a wider regional strategy.

The Houthi Red Sea campaign, which has disrupted commercial shipping since late 2023, has been publicly tied to a specific demand: the group says it will stop attacks only when Israel ends its war in Gaza and lifts its blockade (Crisis Group). Iran's reported directive adds a second, separate condition: closing the strait as a proportional response to US military action against Iran itself, unrelated to Gaza. This dual-condition structure means the Red Sea route could be shut even if the Gaza conflict resolves, should US-Iran tensions escalate on their own.

The directive's logic builds on a military landscape the Houthis have spent years shaping. Since 2019, the group has pushed into Yemen's energy-producing south with varying intensity. Saudi forces deployed to Shabwa in September 2019 and worked with local authorities toward a de-escalation and ceasefire, with all parties responding positively at the time (Reuters). That de-escalation did not hold. By July 2021, Houthi forces had spread fighting to al-Bayda as they attempted to advance toward the oil-producing Shabwa region (Reuters). In September 2021, Houthi fighters broke through frontlines and made gains across central Marib and southern Shabwa (Reuters). By November 2021, it remained uncertain whether the Houthis would launch a direct assault on the capital of Marib governorate or pivot to seize nearby oil and gas fields (Reuters).

These energy frontlines directly triggered Houthi escalation beyond Yemen's borders. The group extended missile and drone strikes to the UAE after Emirati-backed local militias battled Houthi forces in the energy-producing Shabwa and Marib regions (Reuters). The UAE strikes set a precedent for projecting power from Yemeni territory against Gulf states involved in the conflict — a capability now being repurposed for the Red Sea maritime domain under Iran's reported directive.

The broader context here is a convergence of two escalation pathways that had previously operated on separate tracks. The Houthi Red Sea campaign has been tied to Gaza; Iran's directive ties it to US-Iran deterrence. If the directive represents an operational plan rather than mere signaling, the Houthis would need to execute a maritime closure that their current Red Sea campaign has approached but not fully achieved. A full closure of the Bab al-Mandeb chokepoint to oil traffic would affect a route carrying roughly 12 percent of seaborne crude, with knock-on effects on insurance markets, freight rates, and Gulf export economics. The group's proven ability to strike shipping with drones and missiles, honed through years of combat in Marib and Shabwa, provides the technical baseline for such an escalation.

What remains less clear is the command structure. The Houthis have maintained a degree of operational autonomy within Iran's so-called "forward defense" network, acting on their own declared conditions in the Red Sea even as Tehran supplies components and strategic guidance. A directive to prepare for closure in a specific US-Iran scenario suggests tighter coordination than the Gaza-conditioned campaign implied. Whether that tighter coordination would override the Houthis' publicly stated conditions, or whether the group would frame any closure as satisfying both the Gaza and Iran-demand conditions at once, is a question that the available reporting does not resolve.

The trajectory from Shabwa and Marib to the Bab al-Mandeb is not incidental. The same fighters who pushed through central Yemen's energy-producing provinces in 2021, and who struck the UAE in response to Emirati-backed militia operations, now constitute the force Iran is asking to hold a global maritime chokepoint in readiness. The Saudi de-escalation effort in Shabwa in 2019, brief as it was, stands as the last documented case of a negotiated pause in that southern advance. Its failure to hold points to the difficulty of any diplomatic intervention in a theater where military momentum, external backing, and ideological framing converge.