Russia's anti-doping agency says it is investigating the country's top race-walking coach over doping allegations.
In recent years, at least 20 Russian walkers who trained under national team head coach Viktor Chegin have been banned for doping offences.
The Rusada anti-doping agency says he is suspected of possessing banned substances and either providing or attempting to provide them to athletes.
Chegin is already under investigation by track and field's world governing body, the IAAF, whose senior anti-doping manager Thomas Capdevielle said in February he was "confident" Chegin would be sanctioned.
The IAAF and the World Anti-Doping Agency are also investigating Russian athletics as a whole over allegations of systematic doping.
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