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The Bab al-Mandab strait links Asia to Europe via the Red Sea and Suez canal. Perim island, also known as Mayun, divides the waterway in two, close to its narrowest point. The United Arab Emirates, a former Saudi ally in the anti-Houthi coalition, had been building an airbase on the island before ending its active involvement in the conflict in January.
Saudi Arabia has increasingly relied on the Red Sea and Bab al-Mandab to export its crude since Iran has been targeting vessels in the strait of HormUz. About 12% of the world's goods are typically shipped through the strait.
Full Houthi control of shipping in the strait, alongside Iranian control of the strait of Hormuz, would strengthen the chokeholds of anti-western forces over global energy shipments. Oil prices have risen to more than $100 a barrel as the fighting in Yemen has escalated.