Swimming's world governing body FINA has banned three Russian swimmers from going to the Rio Games, with four more being withdrawn from the team by the Russian Olympic Committee.
Nikita Lobintsev, Vladimir Morozov and Daria Ustinova have been rejected because their names appeared in Richard McLaren's damning report into state-directed doping in Russia.
The Russian authorities have withdrawn Mikhail Dovgalyuk, Yulia Efimova, Natalia Lovtcova and open-water swimmer Anastasia Krapivina from consideration as all have served doping bans before.
FINA is the first international sports federation to ban any Russian athletes since the International Olympic Committee's controversial decision on Sunday to leave the issue of Russian eligibility up to each sport.
The absence of Efimova, a four-time world breaststroke champion, will be a blow to Russia's hopes of picking up medals in the pool in Rio but that news will not be as devastating as the confirmation of the three names McLaren uncovered in his recent investigation. Lobintsev and Morozov, who is based in the US, were part of Russia's bronze-medal winning 4x100m freestyle team at London 2012, while Lobintsev also won a silver medal in the 4x200m freestyle relay at Beijing 2008.
But the confirmation of Ustinova's involvement in the conspiracy to cover up positive drugs tests between 2012-15 is deeply depressing as she is only 17 and looked like being Russia's next great swimming star. A three-time world junior champion and nine-time European junior champion, Ustinova could now be thrown out of the sport as she had been warned by the Russian authorities for failing a test for a prescription steroid when only 14.
FINA's response to the growing doping crisis in the sport has often been criticised but it appears to have developed some stomach for the fight.
In a statement issued on its website, the governing body for all Olympic aquatic sport said the McLaren report clearly showed that anti-doping rules "were not implemented correctly in Russia".
"The exact implication for the Russian Swimming Federation is still to be clarified," the statement continued.
"For this purpose, the matter has been forwarded to an ad hoc commission, which will have to investigate."
It added this commission will "have to consider any further information" that comes from McLaren's investigation now the Canadian law professor has been given the green light by the IOC and World Anti-Doping Agency to continue his inquiries.
But swimming is not the only sport currently vetting Russia's entry list for Rio.
Rowing's governing body is considering what to do about the 28 Russians who have qualified for a place, while an announcement from the International Canoeing Federation is also imminent, with as many as five from that sport believed to be implicated by McLaren.
The International Handball Federation has written to the Russian Handball Federation to ask for the whereabouts of the women's team to enable immediate drug-testing, while boxing, gymnastics and modern pentathlon have told Press Association Sport that they are currently assessing matters.
Archery and equestrian, however, have joined tennis in confirming the eligibility of the Russian entries, while the Russian media is reporting their seven-strong sailing team is already in Rio and will be allowed to compete.
And FINA's statement concluded by saying it had no reason to stop Russia's divers, synchronised swimmers and women's water polo team from taking part in the Games.
There has been no comment from judo, triathlon, volleyball or wrestling since the IOC decided against a blanket ban for Russia, but all four had issued statements in support of clean Russian athletes in the build-up to the IOC announcement.
With only one Russian eligible for the track and field competition and the weightlifting team on the brink of being banned, Russia's hopes of fielding anywhere near the 387 athletes they announced last week are diminishing rapidly.
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