The World Anti-Doping Agency says it is dismayed by the latest claims made about Russian athletics in a German TV documentary.
WADA says it's working to verify allegations coaches gave banned substances to athletes and warned them in advance of testing.
President Craig Reedie says the claims in ARD's programme show there's still "much work" to be done in the country.
Russia's currently banned from international competition over doping problems.
WADA President Sir Craig Reedie said: "At a time when trust in sport is wafer thin, these troubling assertions will do little to reinforce confidence in the Russian anti-doping system when clean athletes need it most. The allegations suggest that there is still much, much work to be done in Russia; and, that we will need the full and unwavering cooperation of the Russian authorities to reverse the damage. Until this happens, clean athletes won’t be able to trust that there is a level playing field."
In a statement, WADA also said that the organisation "has viewed, and is dismayed by, the revelations in yesterday’s television documentary released by German broadcaster ARD. The new documentary, titled ‘Russia’s Red Herrings’, contains new allegations suggesting malpractice by a number of individuals involved in the Russian anti-doping system".
