The former head of Russia’s anti-doping agency, who fled Moscow after turning whistleblower, on Monday welcomed a four-year ban from major sporting events imposed on his country.

“Finally, fraud, lies and falsifications of unspeakable proportions have been punished in full swing,” said Grigory Rodchenkov in a statement.

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Rodchenkov, who lives in the US under a witness protection program after accusing Russia of widespread doping activities, warned however that for the World Anti-Doping Agency (WADA) “there is more to do.”

He said those involved in the doping of athletes “should be punished retroactively.”

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