Paris - WADA said on Thursday that they have "successfully retrieved" data from the Moscow laboratory at the heart of Russia's state-sponsored doping scandal which involved more than 1 000 athletes and 30 sports.
The world anti-doping agency had demanded the data be handed over to complete its probe into the 2011-2015 scandal which saw Russia's athletics team barred from the 2016 Rio Olympics.
"This is a major breakthrough for clean sport," said WADA President Craig Reedie.
In September, WADA conditionally lifted a ban on the Russian Anti-Doping Agency (RUSADA), paving the way for its reinstatement.
One of the conditions was access being granted to the data by the end of 2018.
But when a WADA team arrived last month, Russian authorities raised issues with the certification of their equipment under Russian law and a December 31 deadline was missed.
"It shows we are continuing to make real progress that simply would not have happened without the September 20 decision," added Reedie on Thursday.
"The first phase of the three-phase process outlined by that decision is now complete. The long impasse around access to the former Moscow Laboratory has been broken and that is significantly good news."
Reedie said that WADA will now attempt to authenticate and review the data to ensure it is complete and "that it has not been compromised".
"Once the data have been authenticated, we will be in a position to proceed to the third phase and support the various sports and other anti-doping organisations concerned to build strong cases against athletes who doped and, as part of that, ensure that certain samples that are still stored in the Moscow Laboratory are re-analysed in an accredited laboratory no later than June 30, 2019."