The Russian anti-doping agency has banned five of its athletes for failing doping tests.
All five are race walkers including three Olympic champions.
2008 Olympic champions Valery Borchin and Olga Kaniskina and London 2012 winner Sergei Kirdyapkin are among those to be banned.
Borchin has been suspended for eight years for a second offence ruling him out of the 2016 Olympics in Rio.
Kirdyapkin and Kaniskina have been banned for three years and two months with all cases backdated to late 2012.
2011 world champion Sergei Bakulin and silver medallist Vladimir Kanaykin complete the disgraced Russian quintet with the latter receiving a life ban for a repeat offence.