Russia's anti-doping agency and athletics body were "rotten to the core", says International Olympic Committee vice-president John Coates.
Coates, also the Australian Olympic Committee president, is on Friday presenting Australian race walker Jared Tallent with his belated Olympic gold medal.
Tallent finished second in the 50km walk at the 2012 London Olympics but gets the gold after the post-Games doping ban of race winner Sergey Kirdyapkin of Russia.
"Presenting an Olympic medal is always an honour, but more so on this occasion to be part of rectifying, in some way, the massive injustice perpetrated on Jared by a doping cheat and aided by a Russian Anti-Doping Agency and Russian Athletics Federation that were rotten to the core," Coates said in his speech for the medal ceremony in Melbourne.
Tallent's medal ceremony comes just before the International Association of Athletics Federations rules on Saturday AEST whether Russian competitors will be allowed to compete in the Rio Olympics in August.
Coates said Kirdyapkin was one of six Russian athletes sanctioned for anti-doping rule violations by the Russian Anti-Doping Authority.
"Kirdyapkin was ... unable to scientifically rebut the conclusion of three independent experts, based on irregularities observed in his biological passport, that he had doped," Coates said.
"A cheating athlete - but wait for the sting.
"When the disciplinary committee of the Russian Anti-Doping Authority declared Kirdyapkin ineligible for a total period of three years and two months, they commenced the sanction after the London Olympics.
"Not an issue. Also not an issue that they disqualified his competitive results to coincide with the periods when his blood samples were taken (August 2009 to August 2012), or almost.
"And here's where they were playing games with us.
"They conveniently excluded two periods when Kirdyapkin had been competing and concluded the period during which his competitive results were disqualified ... some six weeks before the London Olympics.
"Kirdyapkin's London Olympic result would have been allowed to stand, and we would not have been here today, had the International Athletics Federation not successfully appealed against him and five other Russian athletes who had received similar favourable treatment."
The Court of Arbitration for Sport ordered in March this year that all competitive results obtained by Kirdyapkin between August 2009 and October 2012 be disqualified, after a World Anti-Doping Agency investigation last year found widespread state-sponsored doping in Russia.