Costa Ronin (born February 3, 1979) is a Russian-born Australian actor and cinematographer, widely recognized for his authoritative portrayals of complex intelligence officers and political figures in major Western television dramas. Born in Kaliningrad and later educated in New Zealand and Australia, he achieved his international breakthrough as Oleg Burov in the critically acclaimed Cold War saga The Americans (2014–2018). He further solidified his reputation as a master of the espionage genre with his role as Yevgeny Gromov in the final seasons of Homeland and as a regular in the heist thriller The Endgame. His film credits include a notable appearance in Quentin Tarantino’s Once Upon a Time in Hollywood and the sci-fi thriller I.S.S. By late 2025, Ronin has joined the main cast of Apple TV+’s alternate-history epic For All Mankind for its fifth season, portraying Lenya, a Soviet politician and former cosmonaut, while also appearing in the second season of the action thriller The Terminal List.