The world governing body’s ruling 15-member executive board met on Sunday via teleconference — with the Rio Games’ Aug. 5 opening ceremony less than two weeks away — and decided that responsibility for ruling on the eligibility of Russians remains with the international federations.

The IOC had said that disciplinary proceedings would be opened against Russian officials mentioned in the World Anti-Doping Agency’s (WADA) McLaren report on Monday.

The report produced by Canadian law professor Richard McLaren described extensive doping and cover-ups across a series of summer and winter Olympic sports and particularly at the Sochi Winter Olympics hosted by Russia in 2014.

The IOC said this week that it would not organise or give patronage to any sports event in Russia, including the planned 2019 European Games, and that no member of the Russian Sports Ministry implicated in the report would be accredited for Rio.

It had also ordered the immediate re-testing of all Russian athletes from the Sochi Olympics, as well as a full inquiry into the alleged doping cover-ups, instructing all international winter sports federations to halt preparations for major events in Russia.

Since then a series of international sports federations, anti-doping agencies and athletes have called for a blanket ban of all sports at Rio, though some have said they are against punishing innocent athletes.

Russian officials and government officers have said the doping allegations are part of a Western conspiracy against their country.

Russian President Vladimir Putin had warned that the affair could split the Olympic movement, bringing echoes of the 1980s when the United States led a political boycott of the Moscow Games of 1980 and the Soviet Union led an Eastern Bloc boycott of the Los Angeles Games four years later.