World Anti-Doping Agency inspectors are leaving Moscow empty-handed after Russian authorities prevented them from accessing key doping data that the country's authorities had agreed to hand over.

Wada reinstated the suspended Russian Anti-Doping Agency in September on the condition Russian authorities hand over lab data, which could help confirm a number of violations uncovered during an investigation that revealed a state-sponsored doping programme designed to win medals at the Sochi Olympics and other major events.

But yesterday, Wada said its delegation "was unable to complete its mission" because Russia unexpectedly demanded its equipment be "certified under Russian law".

Wada says the demand wasn't raised at earlier talks. The deadline to turn over the data is December 31.

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Wada says team leader Toni Pascual will now prepare a report on the failed mission. The Wada compliance review committee that recommended Rusada's reinstatement will meet on January 14-15, where it could recommend the ban on Rusada be reimposed. Wada kept open the option of returning to the lab before the year's end if Russia resolves the issue.

Russian Sports Minister Pavel Kolobkov told local media the Wada team would return but there was no word on the date and no mention of the issue raised by Wada.

Wada leaders portrayed Russia's willingness to turn over the data as a key reason for agreeing to reinstate Rusada despite its failure to comply with key requirements on the "road map" Wada had set out.

"We've tried to come to terms with the Russians on how this was to be done, and this is the first time since discussing it that they've actually said 'yes'," Wada director general Olivier Niggli said in September in an impassioned defence of the decision. "We hope they'll fulfil that promise."

It was a widely criticised decision and the reaction to the weekend's news was predictable.

"Surprise, surprise - anyone shocked by this?" said Travis Tygart, the chief executive of the US Anti-Doping Agency. "Let's hope Wada leadership has finally learned the lesson and immediately declares them non-compliant. Anything else is simply another shiv in the back of clean athletes."

- AP