Mikhail Prokhorov and three Russian biathletes who were banned from competition want to force doping whistleblower Grigory Rodchenkov to testify under oath.
Russian oligarch bankrolls lawsuit against Olympic doping whistleblower
Mikhail Prokhorov and three Russian biathletes who were banned from competition want to force doping whistleblower Grigory Rodchenkov to testify under oath.