Russia was due to hand over the data to WADA by the end of 2018 in order for RUSADA, its national anti-doping agency, to keep its accreditation.
A WADA delegation is in Moscow to retrieve the laboratory data, having returned empty-handed last month.
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(Reporting by Andrey Ostroukh and Tom Balmforth; Writing by Gabrielle Tétrault-Farber; Editing by Kevin Liffey)
