Donald Trump signed the proclamation on 13 August. It carries the title Adjusting Imports of Unmanned Aircraft Systems and Unmanned Aircraft Systems Components into the United States.

It rests on Section 232 of the Trade Expansion Act of 1962, the national security clause, and on Section 604 of the Trade Act of 1974.

The rates, and what counts as sensitive

Two tiers apply from 3 September. The 100% rate covers drones with a maximum take-off weight above 25kg, drones with thermal imaging, docking stations for them, and a list of critical components.

Everything else lands at 25%. That covers drones of 25kg or less and the other components the annexes name.