Russian Deputy Prime Minister Vitaly Mutko said "athletes broke rules and many coaches don't understand how to work without doping -- it's time for them to retire." (AFP Photo/Roman KRUCHININ)

Moscow (AFP) - Russian athletics coaches "don't understand how to work without doping", Deputy Prime Minister Vitaly Mutko said Tuesday, after the IAAF extended a ban on the country's team to the world championships.

Russia has been barred from international track and field competition -- including the Rio Olympics -- since November 2015 following a damning report alleging state-sponsored doping in the country in Olympic sports over several years.

Moscow denies any state role in doping but Mutko, who was promoted from sports minister to deputy prime minister despite the doping controversy, pointed the finger at Russia's athletics coaches.

Russia's tainted athletics federation ARAF "had a lot of (doping) violations", he told the R-Sport agency.

"Athletes broke rules and many coaches don't understand how to work without doping -- it's time for them to retire."

On Monday world athletics boss Sebastian Coe said that Russia could not be reintegrated into the sport before November, meaning the country will miss August's world championships in London.

The IAAF said Russian progress over doping was mixed, pointing also to "unhelpful public comments recently made by some Russian sporting officials" -- a possible reference to the outspoken Mutko, who is close to Russian President Vladimir Putin.

Mutko said that Russia -- which insists that drug cheating is an international issue -- was cleaning up its act.

"Over the past year we have done a massive amount of work," he said.

"They (IAAF) tell us: you have done great work but there is still a lot to be done (to stop Russian doping).

"That happens when there aren't clear criteria, clear regulations."

ARAF deputy chief Andrei Silnov said he was buoyed by IAAF comments which said that while Russia was not ready to return to the fold, it recognised "several positive developments".

"They don't have any serious grudges against us," he told a press conference.

Individual Russian athletes can apply to take part in international events as neutrals if they are deemed drug-free.

However, the reigning 110m hurdles world champion Sergey Shubenkov, who has applied to compete as a neutral, said that the latest IAAF verdict would do little to help Russian athletes.

"They said we have a chance to compete as neutrals but for some reason we still do not compete," he said.

Sports minister Pavel Kolobkov told TASS news agency that if any Russian athletes qualify as neutrals then Moscow would guarantee funding.