The IAAF has been left "frustrated" by Russian back-sliding on issues critical to the country's reintegration into global track and field, a top official said Sunday.

International Association of Athletics Federations 'frustrated' as Russian ban upheld

The World Anti-Doping Agency (WADA) said on Tuesday it had retrieved more than 2,000 samples from a tainted Moscow laboratory that will be used to strengthen cases against athletes who may have cheated.

WADA retrieves more than 2,000 samples from tainted Moscow lab

McLaren, a member of the Agency, said the Russian sports ministry oversaw the manipulation of athletes' results and sample swapping

World Anti-Doping Agency: Moscow laboratory protected doped Russian athletes at Sochi Olympics

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International Association of Athletics Federations 'frustrated' as Russian ban upheld

WADA retrieves more than 2,000 samples from tainted Moscow lab

World Anti-Doping Agency: Moscow laboratory protected doped Russian athletes at Sochi Olympics