The whistleblower whose evidence led to Russia's ban from next month's Winter Olympics is preparing to testify against those involved - even though his life is under "serious threat", his lawyer says.
Former Russian anti-doping official Grigory Rodchenkov fled to the United States after his allegations about a state-sponsored doping programme.
The International Olympic Committee (IOC) has handed life bans to 43 athletes involved in the doping programme - though 42 of those have appealed to the Court of Arbitration for Sport (Cas).
Their cases will be looked at in the coming weeks and Rodchenkov's lawyer, Jim Walden, says his client will likely give evidence at the hearings.
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