Russia's anti-doping agency chief on Wednesday launched a scathing attack on Russian athletics bosses ahead of this month's world championships in Doha, accusing them of obstructing testing.
"I'm calling on all the federation's directors to resign," RUSADA director general Yuri Ganus told France's L'Equipe sports daily.
Russia was barred from international competition in 2015 over a vast state-run doping conspiracy.
While Russia's anti-doping agency RUSADA is now under new leadership, Ganus claims that the old guard at the country's athletics federation (RUSAF) is hindering progress in cleaning up the sport.
"We (RUSADA) are cooperating with the IAAF, we are conducting investigations," he told L'Equipe.
"The scale of the backlog is crazy. It's the problem of the system, because there is proof of intervention from a higher body.
"There are those who are against my work, for example the Sports Minister (Pavel Kolobkov) has defended and continues to support (RUSAF chief Dmitry) Shlyakhtin at the head of the athletics' federation."
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