A doping scandal will keep the Russian track-and-field team from competing in the Olympics in Rio later this summer. The I.A.A.F., the worldwide body responsible for governing the sport, announced that it is banning the nation’s team from participating in the Games because Russia has not met certain requirements regarding its anti-doping infrastructure and the culture around doping has not been sufficiently addressed.

At the time, WADA recommended that Russian track-and-field athletes be barred from Rio. The I.A.A.F. did not take any immediate action, but the International Olympic Committee called the allegations “deeply shocking” and said it would study the report and “take whatever measures needed to safeguard clean athletes, clean sport, and good governance.”

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While Russia immediately and vehemently denied all the claims made in the report, the country’s track-and-field athletes were subsequently suspended from international competition. Russian officials have spent the last seven months pushing to assert that its athletes are clean, and that it will only send those who have not been found to have doped in the past to Rio in August.

But last month, the director of the country’s anti-doping lab at the time of the Sochi Winter Olympics in 2014 came forward with a detailed account of how Russian officials ran what can be considered as one of the most sophisticated and surreptitious doping rings in history. Grigory Rodchenkov told The New York Times of individuals passing urine bottles through a tiny hole in the wall of a testing lab late at night to replace urine samples that would test positive for performance-enhancing drugs from within the supposedly tamper-proof vials. What the lab would have found, Rodchenkov alleges, is that athletes were doping with a three-drug cocktail of illegal drugs used to allow them to recover faster and train harder. To make the drugs even more potent and work even faster through absorption, he infused the cocktail into whiskey and vermouth and told athletes to swish it around in their mouths and let it hang out under their tongues.

Earlier this week, WADA said Russian athletes have continued to dope, even after it issued its report last fall.

The International Olympic Committee, which is set to meet on Tuesday, has final say in the Games, and could technically overrule the I.A.A.F. It would be unprecedented for it to do so.