Andrei Minzhulin tells the R-Sport news agency he failed a doping test for the endurance-boosting drug, which was banned as of Jan. 1, when he won the 5,000 meters at the Russian indoor nationals last month.

Minzhulin says he stopped taking meldonium in November but it remained in his system.

Minzhulin is the second Russian runner in two days to test positive for meldonium. Nadezhda Kotlyarova, a veteran 400-meter runner who reached the semifinals at last year's world championships, also tested positive.

Besides the Russians, there are also ongoing meldonium cases involving former 1,500-meter world champion Abeba Aregawi of Sweden and former European 800-meter indoor champion Nataliya Lupu of Ukraine.

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