The US and Israel first launched strikes on Iran two weeks ago. In response, Iran has launched more than 2,000 drones at targets across the Middle East, towards Israel and Gulf countries with US military bases. We’ve seen attacks on oil tankers, airports, and even luxury hotels and banks.

The drones are causing considerable damage across the region considering they have a simple design and are relatively cheap to produce. The Shahed 136 long-range drone, which is manufactured in Iran, is estimated to cost between $20,000 to $50,000. Iran is thought to have mass-produced tens of thousands of the Shahed drones before the war, but we don’t know how much of that stockpile remains intact after days of US and Israeli strikes.

The BBC’s Bernd Debusmann Jr explains why Iran is using these drones and why they are expensive to counter. We look to Ukraine, which has developed its own cheap drones to down Russian ones. And we discuss how Iran’s stockpiles of these drones could play a big factor in how long the war lasts.

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