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 yesterday.

Rune Andersen, head of the doping task force for the International Association of Athletics Federations (IAAF), said he had recommended to the IAAF Council, which duly followed his advice, that it uphold its ban on Russian athletes, first imposed in 2015 over mass state-sponsored doping.