Drone strikes

The military drone bonanza

Data: The Drone Databook; Map: Andrew Witherspoon/Axios

About half of the world's militaries are now flying drones, according to a sweeping new study published this week that revealed the swift spread of a critical technology that until recently was too expensive or sophisticated for most countries.

Why it matters: The increasingly robot-crowded skies mean that clashes involving drones — like the recent attack on a Saudi oil facility that the U.S. has blamed on Iran — are likely to become commonplace.

Trump on Iran drone attack: "I have a feeling it was a mistake"

President Trump said in a pool spray with Canadian Prime Minister Justin Trudeau Thursday that he does not believe Iran intentionally shot down an unmanned U.S. drone flying in international airspace over the Strait of Hormuz, claiming it was probably "a mistake made by somebody who shouldn't have been doing what they did."