engage in espionage(осуществлять шпионаж в пользу = engage in espionage on behalf of. Some agents require little or no persuasion on the part of intelligence officers to engage in espionage on behalf of the U.S. Alexander Demidov)
confession of spying(fbi agent's reputed confession of spying is described in court | Iranian state television aired what it said was a "confession" of spying by Valuch on January 16. | Marshal Blyukher was one of the last officers to be taken to Moscow, where he perished, having refused to sign a confession of spying for Japan. Alexander Demidov)
