US President Donald Trump has imposed steep tariffs on imported drones and their components, potentially complicating Ukraine’s plans to expand UAV sales to Washington.

Under a proclamation signed on Thursday, drones weighing more than 25 kg and those equipped with thermal imagers will face tariffs of 100%, along with certain docking stations and critical components. Smaller unmanned aircraft will be subject to a 25% levy.

Lower rates will apply to selected US partners, including 15% tariffs for the EU, Japan, South Korea, Switzerland, and Taiwan, and 10% for the UK. The measures are set to begin taking effect in 21 days, with some delayed for 180 days.

Trump said a Commerce Department review found that the US was “too reliant” on foreign drones and components. The White House said the measures are intended to reduce supply-chain and security risks while rapidly expanding domestic production.

The move, however, could complicate Kiev’s recently revived push to sell drones to the US.

Trump said last month that Washington would buy Ukrainian UAVs, while Reuters later reported that Kiev had agreed to export drones for the Pentagon’s Drone Dominance program. During discussions last year, Ukrainian leader Vladimir Zelensky suggested a broader drone deal with the US could eventually be worth between $10 billion and $30 billion.

Ukraine was not listed among the countries receiving reduced tariff rates in Trump’s proclamation. Neither Washington nor Kiev has explained whether the planned purchases will receive an exemption or how the new duties could affect the proposed agreements.

Trump’s new tariffs come as the Pentagon has been racing to expand its own unmanned capabilities, with US officials acknowledging that Washington has struggled to keep pace with the rapidly evolving use of cheap reconnaissance and attack drones in the Ukraine conflict.

Kiev, meanwhile, has been aiming to turn its domestic weapons production into a major source of export revenue despite continuing to heavily rely on Western military and financial support.

Ukrainian officials have spoken of earning billions from weapons sales and opening export hubs across Europe. At the same time, the country’s defense sector has been hit by major corruption scandals, including investigations into alleged embezzlement and inflated procurement contracts. European officials have also raised concerns over weapons supplied to Kiev disappearing and potentially reaching criminal networks.