As the US-Iran memorandum of understanding unravels and the confrontation shifts toward the Strait of Hormuz, renewed fighting in Yemen is raising a broader question: is Tehran preparing another source of maritime pressure at Bab al-Mandab?
Hezbollah and Hamas have been severely weakened by Israeli military operations. The Houthis, by contrast, remain armed, entrenched and positioned astride one of the world's busiest shipping lanes.
Even a credible threat to Bab al-Mandab could unsettle shipping, energy markets and global supply chains. For Iran, that threat alone may be valuable.
The fight over one airplane
The latest escalation followed Yemen's decision to block an Iranian aircraft carrying a Houthi delegation returning from the funeral of Supreme Leader Ali Khamenei in Tehran. Yemen's internationally recognized government accused Iran of attempting to enter its airspace without authorization.
The dispute quickly escalated. An attack damaged Sanaa International Airport's runway. The Houthis blamed Riyadh before targeting Saudi Arabia's Abha International Airport with missiles and drones.
Senior Houthi official Mohammed al-Bukhaiti later warned of what he described as a "siege" of the Kingdom and openly identified Bab al-Mandab as a strategic pressure point.
"The key thing here was the precedent," Chatham House fellow Thomas Juneau told Iran International. "Iran and the Houthis are trying to force open the air bridge between Tehran and Sanaa."
Iran has long supplied the Houthis through maritime smuggling routes stretching around Oman and the Horn of Africa. Those routes are slow, costly and vulnerable to interdiction.
A direct air bridge would dramatically improve Tehran's ability to move sensitive military components into Houthi-controlled territory. That is why one apparently ordinary passenger flight mattered.
Rebuilding the Houthis
Farzin Nadimi, a defense and security analyst at the Washington Institute, believes Iran's urgency reflects another problem: after years of Red Sea operations and repeated US and Israeli strikes, the Houthis are running low on some of their more advanced military capabilities.
"They are very much eager to help the Houthis rebuild their strategic inventory in order to be a viable player again," he said.
Nadimi suspects the aircraft may have been carrying critical weapons components, although there is no independent confirmation of its cargo.
Modern missile and drone forces depend less on complete weapons than on a steady flow of electronics, guidance systems, engines and other specialized components.
If the Houthis are running low, a direct air link would offer Tehran a faster and more reliable route to replenish those capabilities.
A second chokepoint
The strategic importance extends well beyond Yemen.
The dispute between Tehran and Washington is already centered on the Strait of Hormuz, where Iran has demonstrated the leverage that can be created by threatening one of the world's most important energy corridors.
A revitalized Houthi force capable of disrupting Bab al-Mandab would force Washington, Saudi Arabia and their regional partners to consider the security of two strategic waterways simultaneously.
"Iran, having demonstrated the extraordinary value for itself of closing the Strait of Hormuz, absolutely understands that if it closes both Hormuz and Bab al-Mandab at the same time, the effect would be magnified," Juneau said.
"The effect on the global economy, the ability to pressure the US, to pressure Saudi Arabia and to pressure all of their allies."
Juneau cautioned that neither Tehran nor the Houthis appear poised to close Bab al-Mandab in the near term. But the ability to credibly threaten it would give Iran another source of strategic leverage.
Yemeni-American researcher and author Fatima Abo Alasrar believes the latest confrontation was deliberately engineered by Tehran.
"I think, honestly, Iran has engineered this escalation," she said.
In her view, widening the potential cost of confrontation creates another avenue through which Tehran can shape future negotiations with Washington.
Saudi Arabia's red line
The confrontation also threatens to upset the fragile balance that has prevailed in Yemen since the 2022 truce.
Saudi Arabia has spent years trying to extricate itself from a costly war that increasingly looked unwinnable.
"It's really Saudi Arabia that's been absorbing a lot of the pain here," Juneau said.
The Houthis understood Riyadh's reluctance to return to full-scale conflict and repeatedly tested how far they could push.
The attempt to establish a direct air bridge between Tehran and Sanaa appears to have crossed a different threshold.
Saudi Arabia may still prefer de-escalation. But allowing Iran an easier route to replenish Houthi military capabilities would strengthen an armed group positioned directly on its southern border and potentially restore its ability to threaten Saudi cities, airports and energy infrastructure.
Alasrar described Saudi Arabia and the Houthis as pieces on a much larger geopolitical chessboard.
"Houthis and Saudis are almost like pieces on a chessboard that are fighting with each other right now," she said. "But it's Iran and the US that get to impose everything."
Whether the Houthis intend to launch a renewed campaign around Bab al-Mandab remains uncertain. Juneau cautions they are not simply Iranian proxies waiting for orders, while Nadimi expects de-escalation unless the wider US-Iran confrontation expands significantly.
Hormuz has already demonstrated the leverage created by maritime chokepoints. Iran may not even need the Houthis to close Bab al-Mandab. If it succeeds in rebuilding their capabilities, simply making the threat credible could become a source of strategic pressure in its own right.
