BRAZIL

cused Russia of a mass cover-up of failed drug tests.

Some federations have taken a tough line, excluding many Russian team members from events such as rowing, canoeing and swimming. Other sports, such as judo and tennis, have allowed the entire Russian team to compete in their sport. These rulings must still be ratified by CAS.

Some Russian athletes had flown to Rio in advance of the main delegation, including gymnasts and swimmers. Russia’s head swim coach Sergei Kolmogorov told Russian agency R-Sport that swimmers barred from the games, including world 100-meter breaststroke champion Yulia Efimova, were at a pre-Olympic training camp in Brazil in the hope of a late reprieve to allow them to race in Rio.

Russia’s weightlifting team has been dogged by doping cases and faced further embarrassment Wednesday when retests of samples from the 2012 Olympics saw four Russians, including three medalists, test positive. The entire lifting team risks being banned from the Rio Games because of the large number of failures in retests from the 2008 and 2012 Olympics.

Putin last week called for the creation of a new statebacked anti-doping commission to draw up future strategy. In a clear sign of coordination, it was set up within hours under Vitaly Smirnov, a former Soviet sports minister and IOC member.

Smirnov told local media Thursday that the new commission would be independent of the government, despite containing several senior figures with links to the Kremlin.

Smirnov also insisted that the government was not involved in doping, despite allegations in the report for WADA by Canadian lawyer Richard McLaren that sports ministry officials oversaw a mass doping program and a cover-up.

“We will welcome the arrival of WADA and we rule out any attempts at interference by the state or other structures,” he said. “In Russia there is not and never has been any state support for doping.”