Russia could face a complete Olympic ban if allegations of state-sponsored doping at the Sochi Winter Olympics in 2014 are proven today. An independent commission set up by the World Anti-Doping Agency (WADA) has been investigating the claims and is now set to publish its findings.
Currently, only Russian track and field athletes are banned from international competition, including the Rio Olympics, after athletics' world governing body the IAAF voted last month to maintain a global competition ban on the All-Russia Athletic Federation. But individual athletes still can compete as neutrals if they prove they are clean.
The Russian weightlifting team is also facing the prospect of a ban from Rio after repeated anti-doping violations.
The commission, headed by Dr Richard McLaren, has primarily been looking into claims made by the former director of the WADA-accredited laboratory in Moscow, Grigory Rodchenkov, that he doped dozens of athletes, including at least 15 medalists, in the build-up to the Sochi 2014 Winter Games.
Rodchenkov told The New York Times in May that he did this in concert with the Ministry of Sport and that he also doped athletes before London 2012, the 2013 World Athletics Championships in Moscow and 2015 World Swimming Championships in Kazan.
But Sports Minister Vitaly Mutko condemned the allegations as "a continuation of the information attack on Russian sport".
Russia is currently challenging the ban on track and field athletes at the Court of Arbitration for Sport, with the tribunal expected to conclude on 21 July.