London 2012 - Yulamanova among Russia doping bans
Three leading female Russian athletes, including European marathon champion Nailya Yulamanova, have been banned for two years for doping.
Svetlana Klyuka, second in the 800 metres at the 2006 European championships, and 2011 European 800 indoor winner Yevgenia Zinurova, were also suspended for "abnormal indexes in their biometric passports", the country's athletics federation said.
Yulamanova finished second in the marathon at the 2010 European championships in Barcelona but was upgraded to the gold medal after the winner, Lithuania's Zivile Balciunaite, was disqualified and banned for using steroids.
There was no marathon competition at the 2012 edition in Helsinki, Finland last week due to it being an Olympic year.
The suspensions involving 31-year-old Yulamanova and Klyuka, 33, have been backdated to February. The ban for Zinurova, 29, began in September.
As all three are ineligible to compete at this week's Russian championships, they will not race at the London Olympics that start on July 27.