Russia should be banned from this summer's Olympics and Paralympics after evidence was found of a four-year, state-sponsored doping programme, says the World Anti-Doping Agency.
A Wada-commissioned report found urine samples of Russian competitors were manipulated across the "vast majority" of summer and winter Olympic sports from late 2011 to August 2015.
The International Olympic Committee (IOC) will decide on Tuesday whether to provisionally ban Russia from the Rio Olympics, which start on 5 August.
IOC president Thomas Bach will host a telephone conference call to decide on "provisional measures and sanctions".
The 62-year-old German lawyer and former Olympic fencing champion has promised the "toughest sanctions available".
He said the findings of the report are a "shocking and unprecedented attack on the integrity of sport and on the Olympic Games".