Costa Ronin plays Sergey Vodianov in the new NBC drama "The Endgame."Ronin, who was born and raised on the west coast of Russia, recently completed principal photography on the independent feature "I.S.S," opposite Chris Messina. He was recently seen in Quentin Tarantino's "Once Upon a Time in...Hollywood" and is best known for his roles on the hit drama series "The Americans" and "Homeland."Other TV credits include "Splitting Up Together," "Extant" and "Gotham."