Jared Tallent is set to receive Olympic gold after CAS ruled Sergey Kirdyapkin and five other Russian athletes had bans wrongly imposed.
Sergey Kirdyapkin is set to be stripped of his 50 kilometre walk gold medal from the 2012 Olympic Games after the Court of Arbitration for Sport (CAS) ruled that bans were wrongly imposed on six Russian athletes.
The IAAF appealed to CAS to contest what it felt was the "selective" disqualification of results by the Russian Anti-doping Agency (RUSADA) in the cases of six athletes who were banned for doping offences.
CAS upheld the appeal from athletics' world governing body, with Kirdyapkin's results between August 20, 2009 and October 15, 2012 annulled.
The verdict is set to result in Australia's Jared Tallent taking gold after finishing behind Kirdyapkin in London four years ago.
Retired race walker Olga Kaniskina stands to lose her silver medal from the 20km walk in the London Games following a verdict which was announced by CAS on Thursday.
Yuliya Zaripova had already been informed that she would be stripped of the 3,000 metre steeplechase gold medal from the last Olympics and CAS ruled that she should also lose the World Championship gold she was awarded in Daegu back in 2011.
Sergei Bakulin is another race walker who was crowned world champion in 2011, but CAS ruled that his result in the 50km final at the Daegu Games should not count and the same applies to the silver medal Vladimir Kanaykin was awarded following the 20km race in South Korea five years ago.
CAS deemed that Kanaykin's lifetime ban should be replaced by an eight-year ban, while fellow race walker Valeriy Borchin - winner of an Olympic gold medal in the 20km walk in 2008 who was suspended for eight years for a second offence - has had his results from August 14, 2009 to October 15 2012 disqualified.
The IAAF expressed its gratitude to CAS for the verdicts and said it will "immediately proceed to the effective disqualification of results, re-rankings and reallocation of medals in all competitions under its control."
The governing body also stated it will contact the International Olympic Committee to request the disqualification of Olympic results and reallocation of medals.
The All-Russia Athletic Federation (ARAF) was suspended by the IAAF amid allegations of state-sponsored doping in a report from an independent commission established by the World Anti-Doping Agency last November.