Iran's Guards Direct Houthi Seizure of Red Sea Port, Tightening Strait Chokehold

The Houthis' lightning advance down Yemen's Red Sea coast last week was no spontaneous insurgent push. According to Yemeni government officials, Iranian sources, and regional diplomats, Iran's Revolutionary Guards orchestrated the campaign with direct military guidance, sending senior commanders into Yemen to oversee operations and shape strategy. The objective was clear: seize the southwestern port city of Mocha and tighten control over the Bab el-Mandeb Strait, one of the world's most vital shipping channels. By doing so, the Houthis have deepened their chokehold on a waterway whose disruption ripples through global energy markets, compounding the effects of Iran's separate blockade of the Strait of Hormuz.

The timing and scope of the operation point to careful coordination. Last week, according to two Iranian sources, Tehran instructed the Houthis to escalate attacks on Saudi Arabia—a close U.S. ally—and pledged additional funding, weapons, and senior military officers to support the effort. Multiple Yemeni military officials, citing intercepted communications and accounts from captured Houthi prisoners, believe the campaign was directed by Abdolreza Shahlaei, a top Revolutionary Guards commander assigned to the Qods Force, the Guards' elite unit. Iranian sources did not immediately confirm Shahlaei's role, though they acknowledged he has spent time in Yemen in recent years. The Guards have managed to move weapons and personnel into and out of Yemen despite an aerial and maritime blockade of Houthi-controlled areas, though the sources offered no specifics on how.

Iran maintains a careful public posture on the relationship. While describing the Houthis as allies, Tehran denies directing them militarily, insisting they are not proxies. One Iranian official offered a different framing: the Mocha seizure was a Houthi decision, not an Iranian one, but it served Iranian interests by pressuring oil prices upward and damaging both the United States and Saudi Arabia. The distinction between directing an operation and benefiting from it remains contested in the accounts, but the material support is not disputed.

The Houthis' capacity to execute such an offensive reflects years of Iranian investment. Ahmed Nagi, a Yemen analyst at the International Crisis Group, noted that the western coast advance was not hastily assembled. "The evolution of the Houthis was basically because of the new weapons they gained, either through the Iranians directly or through the different smuggling networks that they are counting on," Nagi said, pointing to their sophisticated use of drones in the latest push. The offensive itself began with a barrage of rocket fire across the Tihama, the flat, narrow coastal plain where Mocha sits.

Saudi Arabia's response has been notably restrained. As the Houthis advanced last week, Yemen's government—backed by Riyadh—requested intensified Saudi air support, including campaigns against Houthi targets in their heartland around Sanaa and strikes on strategic assets like oil depots. Instead, Saudi Arabia limited itself to logistical, armament, and intelligence support, with only scattered air strikes focused on northern battlefronts in Jawf and Marib provinces. Two Yemeni officials assessed that Riyadh was reluctant to provoke a major escalation with the Houthis, fearing heavier drone strikes on Saudi territory itself. Saudi officials did not respond to requests for comment on their strategic focus.

The broader military picture in Yemen remains murky. A ceasefire agreed in 2022 has held for years, creating a pause in major warfare that makes current assessments difficult. Both Iran and Saudi Arabia have invested heavily in their respective forces on the ground, yet the Saudi-backed government coalition has fractured internally. Previous rounds of fighting in the Tihama have seen sudden advances and reversals, but whether Saudi-backed forces can dislodge the Houthis this time is uncertain. Nagi cautioned that while government forces might achieve some gains with sufficient Saudi backing, "that could be a bit difficult this time." The Houthis now control a critical chokepoint, have demonstrated advanced military capabilities, and enjoy the active support of a regional power with deep pockets and strategic ambitions. What happens next depends partly on whether Saudi Arabia decides the risk of escalation is worth the cost of pushing back.