Another Hormuz? What to Know About the Houthi Threat to the Red Sea

Council on Foreign Relations | Diana Roy

Yemen-based Houthi rebels declared a complete naval blockade on Saudi Arabia on July 20, 2026, threatening to choke off the strategic Bab el-Mandeb Strait. This unilateral escalation targets a critical maritime corridor that facilitates approximately 12 to 15 percent of global trade, valued at over $1 trillion annually.

The blockade follows the collapse of a temporary United States-Houthi ceasefire and marks a significant expansion of the group's maritime campaign beyond its previous targeting of Israeli-linked shipping. With Saudi Arabia exporting four to five million barrels of oil per day through Red Sea ports, a sustained disruption in the strait risks severing vital energy corridors and forcing highly inefficient rerouting around the Cape of Good Hope. Furthermore, the threat extends to digital infrastructure, as the waterway hosts undersea fiber optic cables carrying 90 percent of Europe-Asia internet traffic. Consequently, this blockade intensifies the broader proxy conflict between Washington and Tehran, testing Western maritime security initiatives like Operation Prosperity Guardian.

Comment

The Houthi declaration of a naval blockade targeting Saudi Arabia exposes the operational limits of US-led maritime coalitions like Operation Prosperity Guardian. By leveraging land-based anti-ship missiles and drones along the Bab el-Mandeb Strait, the insurgent group can effectively bypass traditional naval deterrence without deploying a conventional fleet. This operational asymmetry forces Western commanders to choose between resource-intensive escort missions or launching escalatory land strikes similar to Operation Rough Rider.

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