A 41-year-old US soldier accused of spying for Russia was arrested in England, with UK counter-terror police detaining him as part of a joint investigation. The senior service member was taken into custody near Gloucester on Tuesday. He was held at a London police station, police said. Authorities said the arrest was made under allegations linked to the 2023 National Security Act. The accusations include offences relating to obtaining or disclosing protected information and providing assistance to a foreign intelligence service. Counter-terror officers carried out searches in Gloucestershire at two different addresses during the investigation. The soldier was confirmed to be serving at Imjin Barracks in Innsworth, a site that serves as headquarters for the NATO Allied Rapid Reaction Corps. Vicki Evans, the senior national coordinator for the Metropolitan Police Counter Terrorism Unit, said the detention resulted from close cooperation between UK and US authorities and that the allegations are serious. The investigation remains ongoing. The FBI Director Kash Patel said the US would not offer concessions to those who break their oath. FBI data cited by the director pointed to a 53% rise in espionage cases over the previous 21 months. US Army Counterintelligence Command Brigadier General Sean Stinchon said the case underlined the reality of internal threats. The soldier remains in custody as the investigation continues.