Houthi forces' September 2026 advances along Yemen's Red Sea coast, including seizure of Mocha port, Perim Island, and Hanish islands, have placed the group in direct control of approaches to the Bab el-Mandeb Strait, enabling selective strikes and a declared ban on Saudi-linked vessels. This has driven tanker and cargo transits down sharply—often 50% or more from prior levels—with many operators rerouting around the Cape of Good Hope to avoid missile, drone, and insurance risks, even as some non-targeted traffic persists. No formal closure has been declared by maritime authorities, and Houthis maintain that navigation remains orderly for most vessels. Saudi-led preparations for a counteroffensive and broader regional tensions tied to Iran-linked conflicts continue to shape volatility, with potential escalation or de-escalation hinging on military movements and diplomatic channels in the coming weeks.