The IOC says it has stripped Russia of an Olympic silver medal from the women's 4x400m relay at the London 2012 Games for doping.
The IOC says Antonina Krivoshapka tested positive for the anabolic steroid turinabol in reanalysis of samples from the 2008 and 2012 Olympics.
Russia previously lost their women's 4x400m silver from the 2008 Beijing Olympics in a separate doping case.
Medals could later be reallocated. Jamaica were third in the London relay, which was won by the United States. Ukraine were fourth.
The IOC says Krivoshapka has also been disqualified from her sixth-place finish in the individual 400m in London.
Krivoshapka now faces being banned by the IAAF, a move that could threaten her relay gold and individual bronze from the 2013 world championships in Moscow.
