According to the R-Sport news agency, a sample taken from Brezhniva found traces of growth hormones.
The 26-year-old's suspension started on June 22, 2015.
Brezhniva first represented Russia in 2008. In 2013 and 2014 she won the European team sprint title.
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(Reporting By Dmitriy Rogovitskiy; Editing by Toby Chopra)
