Kamila Valieva had failed a test for a banned substance, raising questions over whether she would be allowed to take part in her next event on Tuesday.

A sample from the 15-year-old was taken on Christmas Day - and on 8 February, it returned positive for trimetazidine, a heart medication.

The Court of Arbitration for Sport cited "exceptional circumstances" for its decision, including Valieva's status as a "protected person" under the World Anti-Doping Code, "serious issues" in the process of notifying her of her result, and the fact that a suspension could cause her "irreparable harm".

The court upheld a decision by the Russian Anti-Doping Agency to lift her provisional doping suspension - which had been appealed by the International Olympic Committee, the World Anti-Doping Agency and the International Skating Union.

The women's single, an event for which Valieva is a favourite, begins with the short programme on Tuesday and ends on Thursday with the free skating.