Houthi rebels in Yemen have seized control of the Bab al-Mandeb Strait, a vital global shipping route, escalating the ongoing conflict and creating significant challenges for Saudi Arabia, the United States, and the international energy market. This development comes amid a stalemate in the broader US-Iran confrontation and marks a major strategic shift in Yemen’s civil war.

The capture of the strait follows a rapid advance by Houthi forces along Yemen’s Red Sea coast, culminating last week with the takeover of the port city of Mocha. This move provides the Houthis critical access to the Bab al-Mandeb Strait, through which a substantial volume of global oil trade passes. The seizure has already contributed to disruptions in Saudi oil infrastructure, including the closure of a key east-west pipeline bypassing the Strait of Hormuz after it was targeted by drone attacks.

Saudi Arabia, which has supported Yemen’s internationally recognized government against the Houthis since 2015, faces mounting pressure as the rebels have expanded their control amid weakened government forces. The Houthis’ advances were bolstered by internal divisions within the anti-Houthi coalition and a lack of effective coordination between Saudi, American, and allied forces, reducing the effectiveness of air support and ground operations. Reports indicate that disarray among government troops, including possible misinformation tactics by the Houthis, contributed to recent setbacks.

The conflict’s resurgence follows the breakdown of a ceasefire in July, after which Saudi Arabia intensified airstrikes against Houthi positions. The Houthis are backed by Iran and supported militarily by elements of the Islamic Revolutionary Guard Corps, while their forces now reportedly number over 150,000 with reservists included—surpassing the size of the Yemeni government's military.

Recent attacks by the Houthis extended beyond territorial gains. Last week, they launched strikes on Saudi energy installations and civilian infrastructure, injuring dozens. The group warned of potential retaliation against Saudi Arabia’s key Ras Tanura oil refinery should the kingdom conduct air raids on captured ports.

The capture of Bab al-Mandeb amplifies risks to global energy supplies, with the affected Saudi pipeline accounting for approximately 5% of worldwide oil shipments. Consequently, oil prices surged above $100 per barrel last week, reflecting growing market concerns. The strategic gain also strengthens Iran’s position in the region amid escalating tensions following the collapse of a US-Iran memorandum of understanding earlier this year.

International response to the crisis has been cautious. Despite recent alliances such as the Mecca Joint Defence Agreement signed by Saudi Arabia, Turkey, and Pakistan, military support for Riyadh remains limited. Officials from Pakistan and the United States have publicly declined to commit to direct military intervention or airstrikes, citing a lack of ongoing discussions or requests.

US Central Command commander Admiral Brad Cooper engaged with Saudi officials to assess potential responses, including operations to retake strategically important locations such as Perim island, which oversees key maritime routes near US bases in Djibouti. However, the prospect of American ground troops deploying to Yemen appears unlikely given past challenges and regional sensitivities.

Saudi Arabia faces a difficult strategic calculus. The setbacks underscore the Saudi-led coalition’s reliance on air power without a strong ground component, and the fracturing of Gulf partnerships — notably the rift with the United Arab Emirates, whose more effective military efforts in Yemen have waned following disputes with Riyadh.

Analysts suggest that Saudi Arabia may be compelled to consider renewed large-scale military operations in Yemen to regain lost territory. Others point to the possibility of political negotiations, potentially involving concessions to the Houthis and Iran, though such moves risk empowering hardliners in Tehran and complicating regional dynamics.

Meanwhile, humanitarian conditions in Yemen continue to deteriorate, with renewed fighting exacerbating civilian suffering. The growing control of the Bab al-Mandeb Strait by the Houthis further threatens international shipping and heightens geopolitical tensions as global energy markets grapple with instability just as winter approaches.