Cheap drones can defeat modern air defences, as shown by the attack on Saudi Arabian oil facilities.
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Michael Dempsey
Technology of Business reporter
Saudi oil drone attack
The US says they will help protect the kingdom after an attack on its oil facilities last month.
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The Saudi prince says oil prices could be "unimaginably high" unless the world acts to deter Iran.
Read moreThe crown prince warns oil prices could become "unimaginably high" if the world doesn't act to deter Iran.
The PM is to call for the release of the jailed British-Iranian national when he meets Iran's president.
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The prime minister declines to rule out military action ahead of talks with Iran at the UN.
Read moreAfter attacks against the country's oil infrastructure, the BBC's Frank Gardner surveys the damage.
Frank Gardner
BBC security correspondent, Saudi Arabia
The BBC's Frank Gardner visits the Khurais and Abqaiq facilities targeted by drones and missiles.
Read moreOil prices soared 20% after the drone attacks at the weekend, which the US said came from Iran.
Kasra Naji
BBC Persian
Iran's leaders may have hoped to persuade the US to lift its crippling sanctions, says Kasra Naji.
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