How Were Low-Tech Drones Able To Pierce Saudi Arabian Security?

The relatively low-tech attack managed to pierce the Arab kingdom's air defences despite the country spending $65billion on arms last year alone (pictured, the refinery burns)

Daily Mail: How were low-tech drones able to pierce Saudi Arabian security? Defence system called into question despite country spending $65bn on arms last year including US radar and Patriot missiles - as mocking Putin says they should have bought Russian

* Abqaiq refinery and Khurais oil field were blown up in suspected drone attack, crippling Saudi Arabia's oil exports and cutting off 5 per cent of global supply
* Experts question how low-tech drones were able to pierce Saudi's air security
* Country bought $65bn of arms last year, including US radar and Patriot missiles
* Vladimir Putin said Saudi should have bought his S-400 air defences instead

Drone attacks on Saudi Arabia's oil fields exposes just how vulnerable the kingdom is to assaults using low-cost technology despite being the world's largest importer of arms, experts say.

Saudi Arabia spent an estimated $65 billion on military hardware last year alone, most of which was imported from the United States, including the latest radars, F-15 fighter jets, and Patriot missile defence systems.

But on Saturday an attack using what appears to have been explosive-laden drones managed to pierce that defensive shield and knock out half of the kingdom's oil output, or 5 per cent of global supply.

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WNU Editor: U.S. intelligence is saying that cruise missiles were used .... U.S. intel shows cruise missiles fired at Saudi oil facility came from Iran, officials say (NBC).