Russia’s anti-doping agency says Olympic bobsleigh champion Dmitriy Trunenkov has been banned from his sport for four years.
Trunenkov won his gold medal as part of the four-man team at the 2014 Sochi winter Olympics.
The Bobsleigh Federation of Russia backdated the ban to April, 2016 but did not specify the nature of the offense.
Russian athletics has until now been the worst effected by state-backed doping which has been exposed across many sports. This has led to some international events rescheduling as Moscow grapples with the problem. The IOC is also retesting past samples to see if any have been switched, something it is alleged was carried out by games organisers at Sochi.