Abqaiq-Khurais

Abqaiq, also called Buqayq, and Khurais are two Saudi Aramco facilities in eastern Saudi Arabia. Abqaiq is the world's largest crude oil stabilisation plant, processing the majority of the kingdom's exportable oil; Khurais is a major oilfield producing around 1.5 million barrels a day. On 14 September 2019, both sites were struck simultaneously by roughly 18 drones and 7 Cruise Missiles of Iranian manufacture, taking 5.7 million barrels a day, about 5 per cent of global supply, offline in the largest single-day oil disruption in history. The US and its European allies attributed the attack to Iran; the Houthi movement in Yemen claimed responsibility; Tehran denied involvement.

The attack's lasting significance is doctrinal rather than economic: Saudi production recovered within weeks, but the raid proved that drone-and-cruise-missile swarms could defeat layered air defences and cripple Energy infrastructure FAR more cheaply than that infrastructure can be protected. That lesson reshaped Gulf air-defence procurement and hardened the targeting doctrine Iran would draw on again during the 2026 conflict.

Iran's own forces treated the 2026 war as a chance to test that lesson directly: strikes on Saudi Arabia's Shaybah oilfield in March 2026 were described in Iranian communications as following the Abqaiq-Khurais model. Days later, Saudi air defences intercepted four ballistic missiles aimed at Riyadh and the eastern region that hosts Abqaiq, which alone still processes roughly 7 per cent of global crude supply.