Yulia Stepanova's much-heralded return to action turned into a damp squib on Wednesday when the Russian whistleblower, running as an independent athlete, dropped out of her 800 metres heat with a foot injury having been off the pace throughout.
Russia continues to violate anti-doping rules despite its suspension from international track and field and orders from world athletics' governing body, the IAAF, to eradicate cheating, Germany's ARD broadcaster said on Sunday.
The world governing body for athletics (IAAF) fought back on Tuesday against media reports of suspected widespread doping in the sport, rejecting accusations it failed to investigate dubious drugs test results properly.