Following Russia's banning from the 2018 Winter Olympics and the stripping of medals from multiple Russian athletes, in February 2018, Prokorov agreed to finance a defamation lawsuit in New York against Grigory Rodchenkov, the former mastermind behind Russia's state sponsored Olympic doping program. The suit claims that Rodchenkov defamed three Russian biathletes — Olga Zaytseva, Yana Romanova and Olga Vilukhina — when Rodchenkov included them on a list of athletes who took performance-enhancing drugs as part of a state-controlled program that corrupted the 2014 Winter Olympics in Sochi, Russia. The women, who were stripped of the silver medal they won as part of a relay team, are seeking $10 million each in damages.