LONDON (AP) — A British man plotted with Russian spies to sabotage a drone factory in England, prosecutors said Thursday in a London court.

Joshua Cammidge, 31, was charged with engaging in conduct to materially assist a foreign intelligence service in carrying out activities in violation of the National Security Act.

He did not enter a plea during his initial court appearance. He was returned to custody and ordered to appear Sept. 25 in the Central Criminal Court.

Cammidge was in contact with a suspected representative of the GRU Volunteer Corps, a group controlled by Russia’s military intelligence agency, prosecutor Warren Stanier said in Westminster Magistrates’ Court.

“The essence of communications was locations within the U.K. of factories that manufactured drones and the sabotage of those factories,” Stanier said. “He knew exactly who he was communicating with and the implications of what he was offering to do.”