Three Russian Olympic champions were suspended as part of an investigation into doping in Russian athletics lately. The three, all race-walkers, are Sergei Kirdyapkin, who won gold in the men’s 50-kilometer race at the London 2012 Olympics, and Valery Borchin and Olga Kaniskina, who won men’s and women’s 20km gold at the Beijing Olympics in 2008. Athletes involved in doping scandals - in photo gallery by TASS