Nikolai Nikolaeff (born December 26, 1981) is an Australian actor of Russian and Ukrainian descent who has built a prolific international career spanning television, film, and voice acting. He first gained widespread recognition in Australia for his roles in the youth series Crash Zone and as Dominic "Dom" Masters in the drama Sea Patrol (2009–2011). Nikolaeff successfully transitioned to Hollywood, achieving global acclaim for his portrayal of the ruthless Vladimir Ranskahov in the inaugural season of Marvel’s Daredevil (2015) and his recurring role as Roman Azarov in the action-thriller series Six (2017–2018). His filmography includes high-profile projects such as the sci-fi thriller The OA, the action film Mile 22 (2018) alongside Mark Wahlberg, and a significant role as Ivan in the Netflix film Bruised (2020).