Konstantin "Costa" Ronin (Russian: Константин "Коста" Ронин; born 3 February 1979) is a Russian actor and cinematographer, best known for appearances in Red Dog, as Gregorovich on the SBS drama East West 101, as Oleg Igorevich Burov in the FX drama The Americans and as Yevgeny Gromov on Homeland.

Ronin was born in Kaliningrad, Russian SFSR, Soviet Union (now Russia).

[2] In his youth, he moved to Wellington, New Zealand with his mother and studied international relations and political science at Victoria University, before moving to Perth, Australia for further tertiary education[1] and, later, to Sydney.

[3][4] At age 15, Ronin commenced working and learned about American culture at a radio station that taught English through music.

[3] Growing up in Kaliningrad, Ronin was taught to sail by his father and grandfather at age five and remains passionate about it.