Russian long jumper Darya Klishina has been cleared to compete as a "neutral" athlete at the Rio Olympics, the IAAF has announced.
Athletics' world governing body said in a statement that the 25-year-old, who trains at the IMG Academy in Florida, had become the second athlete to meet its "exceptional eligibility criteria".
But Russian news agency TASS said all other applications from Russian athletes, including pole vault great Yelena Isinbayeva, had been rejected.
The head of the legal department at the Russian Olympic Committee, Alexandra Brilliantova, was quoted by TASS as saying: "The refusals were received by everyone, except for Klishina."
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Jessica Ennis-Hill insists there is no chance of her continuing her career beyond the 2017 World Championships in London.
The Olympic heptathlon champion is building up to the defence of her title in Rio and admits she could hang up her spikes after August's event in Brazil.
"I think at the moment I'm just focused on Rio and being the best prepared I can and going out there and seeing what I can do," said the 30-year-old, who is recovering from an Achilles injury which ruled her out of the indoor season.
"And then it's going to be a decision to make after Rio for me - whether I decide to retire after Rio or whether I decide I want to do one more year and go to the World Championships and retire after that. But I definitely won't be going on any longer than 2017."
The Sheffield athlete will head to Rio as the reigning world champion after her astonishing comeback victory in Beijing last summer when she took gold in only her second heptathlon since London 2012 and just 13 months after the birth of her son Reggie.
Five more countries risk joining Russia on an international athletics blacklist, the IAAF has announced.
Ethiopia, Morocco, Kenya, Ukraine and Belarus have all been ordered to make major changes to their anti-doping programmes by the governing body ahead of the Rio Olympics.
The announcement comes after Russia was told on Friday it must wait until May to discover if its suspension will be lifted in time for the summer Games.
There are no immediate sanctions - it is just a wake-up call at this point - but serious sanctions, provided for under IAAF rules, will only be considered if they don't comply with council requirements.
The Russian athletics federation "may not make it back" for the summer Olympics in Brazil, a former World Anti-Doping Agency president has said.
Dick Pound says that Wada and the International Association of Athletics Federations will not risk their reputations by "rolling over".
Russia's athletics federation has been banned by the IAAF following allegations of widespread doping, and must meet a series of conditions before being readmitted.
His remarks also come after tennis ace Maria Sharapova admitted taking a banned substance.
Organisers of the 2017 World Championships in London are in talks with athletics' world governing body about dropping 'IAAF' from the event's branding.
The doping scandal which has rocked the sport has led to the IAAF being regarded by the public as a "toxic" brand, according to sources with knowledge of the discussions.
The IAAF and its president Lord Coe would have to give consent to the move however, as the original branding was agreed when London won the bid for the 2017 championships in 2011.
It is understood 2017 organisers are hopeful of gaining the agreement of the IAAF because even the world governing body's leaders are aware of the reputational damage caused by the scandal involving Coe's predecessor Lamine Diack, who has been arrested by French police on suspicion of taking money from Russian athletes to cover up doping offences.
The chairman of UK Athletics has said that the fight against doping is “under resourced” and suggested that more sponsorship cash should be used to ensure better tests and transparency.
Ed Warner implied that sponsors could be doing more to help by staying rather than pulling out - and also suggested that football TV sponsorship money should be siphoned off for the fight against cheats.
“One of the things that sport has to do across all sport is find a way to secure more of its revenues for the fight against doping,” he told MPs on the Culture, Media and Sport committee.
Mr Warner said the International Association of Athletics Federations (IAAF) should set aside “a fixed percentage” of all its sponsorship income to spend on anti-doping measures – and also suggested football TV revenues could contribute.
He said it would “make a lot of sense” if football also handed over a “very small proportion” of its global television income to the World Anti-Doping Agency (WADA).
“Football probably wouldn’t notice the difference but WADA certainly would,” he said.
Former marathon world champion Paula Radcliffe has told ITV News "undoubtedly there was really bad corruption" at world athletics' governing body, after the publication of a damning report.
The World Anti-Doping Agency's independent commission found "corruption was embedded" at the International Association of Athletics Federations (IAAF).
"In essence it was a pretty archaic and inept organisation in the way it was functioning", she added.
Radcliffe added that Lord Seb Coe, who is now at the helm of the organisation, "was the right man in charge" in terms of moving forward and restoring the integrity of the sport.