By David Shepardson and Alexandra Alper

WASHINGTON U.S. President Joe Biden's administration on Monday imposed new trade restrictions on 11 Chinese and five Russian companies, accusing some of supplying components to make drones for Russia's war effort in Ukraine.

The Commerce Department, which oversees export policy, added a total of 28 firms, including some Finnish and German companies, to a trade blacklist, making it harder for U.S. suppliers to ship them technology.

Nine of the companies, including China's Asia Pacific Links Ltd. and Russia's SMT-iLogic, allegedly took part in a scheme to supply the previously blacklisted Special Technology Center with drone parts for Russia's Main Intelligence Directorate of the General Staff (GRU).

An investigation by Reuters and iStories, a Russian media outlet, in collaboration with the Royal United Services Institute, a defense think tank in London, last year uncovered a logistical trail that spans the globe and ends at the Orlan drone's production line, the Special Technology Centre in St. Petersburg, Russia.

The investigation found that Hong Kong-based exporter Asia Pacific Links Ltd. has been among the most important suppliers to Russia's drone program. The firm, along with import company SMT iLogic, were the target of an earlier round of U.S. sanctions in May.

The companies did not immediately respond to requests for comment.

"We will not hesitate to take swift and meaningful action against those who continue seeking to supply and support Putin’s illegal and immoral war in Ukraine," the Commerce Department's export controls chief Alan Estevez said in a statement.

Another six Chinese entities were added for allegedly procuring aerospace parts for the Iran Aircraft Manufacturing Company that are used to make drones used by Iran to attack oil tankers in the Middle East and by Russia in Ukraine, according to the Commerce Department.

The Special Technology Center in St. Petersburg, Russia, which once made a variety of surveillance gadgets for the Russian government and now focuses on drones for the military, was first targeted by U.S. sanctions after former President Barack Obama said it had worked with Russian military intelligence to try to influence the 2016 U.S. presidential election.

The United States has aggressively used a trade blacklist known as the entity list to target China's tech sector and attempt to stymie Russia's war in Ukraine.

(Reporting by David Shepardson and Alexandra Alper; Editing by Rami Ayyub)