The International Olympic Committee has obligated the Ukrainian javelin thrower Oleksandr Pyatnytsya to return the silver medal he won in the 2012 Summer Olympics in London after a banned substance was discovered in his doping test sample.

The IOC said in a press release that the reanalysis of Pyatnytsya's samples from the 2012 Olympics in London "resulted in a positive test for the prohibited substance dehydrochlormethyltestosterone (turinabol)."

The IOC ordered that the Ukrainian National Olympic Committee ensure the implementation of the decision, which took effect immediately.