"They have been recognized as having violated anti-doping regulations of the London 2012 Olympics after sample rechecks. The results achieved during those competitions have been canceled," the federation said in a statement.
The IOC is currently rechecking probes from the 2008 and 2012 Summer Olympics, as well as the 2010 and 2014 Winter Olympics. The decision to recheck the samples came amid the Russian doping scandal, which erupted following the publication of the World Anti-Doping Agency (WADA) independent commission report about alleged doping abuse by Russian athletes.
Russia has now been stripped of 25 medals from the 2008, 2012 and 2016 Olympics.
The report also led to the ban of some Russian athletes from taking part in international competitions, including the 2016 Summer Olympics, and a complete banning of Russian Paralympic athletes from participating in the 2016 Summer Paralympics and the 2018 Winter Games.