The Kremlin says there is "understanding" on how crucial data on drug use by Russian athletes will be handed over to the World Anti-Doping Agency.

WADA officials are due to arrive in Moscow on Wednesday for their third visit seeking the lab data. The Moscow laboratory data could help WADA file doping charges against numerous Russian athletes.

Russia missed a deadline to hand over the data by Dec. 31, meaning its anti-doping agency could face sanctions from WADA.

"There were some working disagreements which arose last time related to which storage devices (the data) will be transferred onto and how, and so on. I would say these are not so much substantial matters as issues of logistics," Russian President Vladimir Putin's spokesman, Dmitry Peskov, said Wednesday.

"As far as we know via our sports authorities, there are intensive contacts under way and now understanding has been reached with the WADA representatives regarding how the work will continue."

Despite protests from many Western athletes and anti-doping figures, WADA lifted a suspension on Russia's anti-doping agency, known as RUSADA, in September on condition the country handed over the data by December 31.

A WADA group which visited last month left empty-handed when Russian officials claimed their equipment wasn't certified under Russian law.

Even after the deadline was missed, WADA has said it could still accept Russian cooperation before a committee meeting rules on RUSADA next week. Russia must also make stored lab samples available for analysis by June 30.

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