The Iranian-backed Houthi militia has cut road access to Taiz, one of Yemen’s largest cities, besieging it. Officials there warn of an impending humanitarian disaster.

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The Saudi military has expensive equipment, but the missiles and drones used by the Yemeni militia are difficult to detect and stop.

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R.A.F. Typhoon fighter jets will be deployed to protect infrastructure in Saudi Arabia, Britain said, after a spike in attacks by the Iran-backed Houthi militia.

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