The race walker has had his results from the British capital annulled after a successful appeal by the International Association of Athletics Federations (IAAF).

Thirty-six-year-old Kirdyapkin was one of six Russians whose cases were considered by CAS, after all received varying bans for doping.

The IAAF appealed the suspensions handed out by the Russian Anti-Doping Agency (RUSADA), describing them as "selective".

Today's verdict means that the CAS has sided with the governing body and amended the disqualification periods of the athletes involved.

This will now lead to a forfeiture of medals and titles won in the extended time-frames, including achievements at the Olympics and World Championships.

Kirdyapkin is the most interesting case after he won 50 kilometres gold in London.

He was banned for three years and two months in January 2015, with his sanction back-dated to October 2012.

That allowed him to cling on to his Olympic title, won in August, but CAS has now disqualified his results from August 20, 2009 to October 15, 2012.

Australian Jared Tallent, who has long campaigned to be elevated to first place, will now receive Olympic gold.

The 31-year-old, who also won silver and bronze medals at Beijing 2008, had spoken about his desire for "redemption" as he heads to Rio 2016 in August.

His medal would push Australia up two places on the London 2012 medals table, from 10th to eighth, above Italy and Hungary.

"History has been rewritten," he tweeted.

"I am Olympic champion."

China's Si Tianfeng, who was third, will be given the silver medal while Ireland's Robert Heffernan will be elevated from fourth to the podium, winning bronze.

Kirdyapkin's 50km title from the World Championships in Berlin in 2009 is also void, with Norway's silver medallist Trond Nymark next in line for gold.

Jesús Ángel García of Spain was third in the German capital with Grzegorz Sudoł of Poland fourth.

When announcing its decision today, a CAS statement said: "In each case, the appeal filed by the IAAF has been upheld and the decision issued by the Disciplinary Anti-Doping Committee of the Russian Anti-Doping Agency for each athlete has been modified."

Another walker set to lose a London Olympic medal is Olga Kaniskina, who won silver in the 20km event behind compatriot Elena Lashmanova, who received a two year ban for doping herself in 2014.

Kaniskina, the Beijing 2008 Olympic champion, was banned for three years and two months with CAS now disqualifying her results between August 15, 2009 and October 15, 2012.

Qieyang Shenjie of China finished third behind her in London with another Chinese, Liu Hong, fourth.

Kaniskina's world title from Berlin in 2009 will also be annulled, with Ireland's Olive Loughnane winning gold.

China's Liu Hong will be upgraded to silver with Russian Anisya Kirdyapkina in line for bronze.

Yulia Zaripova, Russia's London 2012 3,000 metres steeplechase gold medallist, has had her results disqualified between July 20, 2011 and July 25, 2013.

She was banned by RUSADA for two years in January 2015 with the suggestion that she lose her Olympic gold, but it was said she should keep her World Championship title won in Daegu in 2011.

With the Championships in South Korea taking place in August and September, that gold medal will now be forfeited, with silver medallist Habiba Ghribi of Tunisia in line to benefit.

She will also receive Zaripova's Olympic title after also coming second in London, and would become the first female gold medallist from Tunisia.

Kenya's Milcah Chemos Cheywa won bronze in Daegu, with her compatriot Mercy Wanjiku fourth.

In London, Sofia Assefa of Ethiopia was third with Cheywa fourth.

Elsewhere, Sergey Bakulin's results have been disqualified between February 25, 2011 and December 24, 2012.

That will see him lose his World Championship 50km walk title from Daegu, which he won ahead of his compatriot Denis Nizhegorodov.

Tallent was third ahead of Si.

Bakulin was initially banned for three years and two months by RUSADA. 

Valeriy Borchin will lose two world titles, his 20km crown at Berlin 2009 as well as his gold from Daegu.

The Beijing 2008 gold medallist was banned for eight years, with his results between August 14, 2009 and October 15, 2012 now annulled.

The silver medallist in Daegu was Vladimir Kanaykin, a former world record holder who was banned for life by RUSADA for repeat offences.

CAS has opted to reduce his lifetime suspension to a period of eight years, but his results between February 25, 2011 and December 17, 2012 have still been declared void.

That will see Daegu bronze medallist Luis Fernando López elevated to gold, with fourth placed Wang Zhen of China in line to move up to silver.

Russia's Stanislav Emelyanov, who was banned for doping in July 2014 for biological passport anomalies, finished fifth in the race.

In Berlin, China's Wang Hao was second behind Borchin with Eder Sánchez of Mexico third and Giorgio Rubino of Italy fourth.

"The CAS is unable to comment on the corrections in the various rankings which may be affected by the present decision and the possible re-allocation of medals, titles, awards or prizes, as this is a matter for IAAF to determine," said a CAS statement.

"With the exception of the case of Vladimir Kanaikin, where the life ban ordered by RUSADA is annulled and replaced by an eight-year ban, the remaining elements of the RUSADA decisions, where by the athletes were found guilty of an anti-doping rule violation and were declared ineligible for a certain period of time, were not challenged and are therefore final.

"The full awards with the grounds will be notified to the parties in the coming weeks."

The IAAF said they were "grateful" to the CAS after their successful appeals.

"The IAAF will immediately proceed to the effective disqualification of results, re-rankings and reallocation of medals in all competitions under its control," a statement said.

"With respect to the Olympic Games, the IAAF will inform the International Olympic Committee of the CAS decisions and request the disqualification of results and the reallocation of medals.

"The IAAF considered this as an important point of principal in the context of the Athlete Biological Passport and is pleased to see that the CAS Panel has taken the strongest possible line and made a strict and full application of IAAF Rules, in the interest of clean athletes and sport justice."