A US military serviceman has been arrested in Britain on suspicion of spying for Russia; the details of the investigation have not yet been disclosed.
FBI Director Kesh Patel said the high-profile arrest was "related to an espionage suspect of concern to the United States and our allies."
Brigadier General Sean Stinchon, commander of the US Army's Counterintelligence Command, said the case demonstrates the strength of partnerships and the determination of the counterintelligence community.