The 2008 Olympic javelin silver medallist Maria Abakumova is among four Russian athletes to be sanctioned for failing drugs tests following reanalysis of samples from the Beijing and London Games.
Abakumova, 30, has been ordered to return the medal she won in Beijing by the International Olympic Committee (IOC) after the 2011 world champion tested positive for prohibited substance dehydrochlormethyltestosterone (turinabol).
Denis Alexeev is another Russian track and field athlete to have tested positive for the same substance, so the 4x400m relay team he was part of must relinquish the bronze medals they were presented with in the Chinese capital.
The 34-year-old Inga Abitova, sixth in the woman's 10,000m, has also has also been disqualified from the Beijing Games as a result of traces of dehydrochlormethyltestosterone (turinabol) discovered in retesting.
Traces of the that prohibited substance also showed up in a sample taken from track cyclist Ekaterina Gnidenko, 23, at London 2012, where she finished eighth in the keirin.