Valieva was virtually unknown a few months ago but burst onto the international figure skating scene this season
Coach Eteri Tutberidze said she was certain Valieva was 'clean and innocent'
Bach said the International Olympic Committee had limited means of action.
Kamila Valieva failed a drug test for a banned substance before the Games.
Beijing OLympics will be remembered for the extremes of its anti-COVID-19 measures
Russian teenage figure skater Kamila Valieva tumbled to fourth place in the women's singles event on Thursday, yielding to the pressure of a doping controversy that has rocked the Beijing Games.
Olympic gold medallist Alina Zagitova might be 15 but the depth of her figure skating career stretches far beyond her years.
All the top action from Day 6 of the 2022 Winter Olympic Games in Beijing on Thursday.
Valieva dominates the ice despite doping scandal