The doping samples of Alyona and Alexei Mikhaltsov, players of the Russian national Rugby sevens teams, have tested positively for the prohibited substance meldonium, a source close to the Russian Rugby League Federation told Interfax.
"Meldonium, a substance prohibited by WADA, has been found in the Mikhaltsovs' blood samples," the source said.
The source said both players previously did track and field athletics. "They are representatives of the Novosibirsk track and field athletics school," the source said.
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