Olympic champion in rhythmic gymnastics Margarita Mamun, 22, ended her career.
One of the leaders of the Russian team will no longer participate in the competitions, the manager of Russian national team Irina Viner-Usmanova told TASS.
After winning the 2016 Rio Olympics, Mamun took a break, but did not rule out her return for the 2018 world championships.
Margarita Mamun won seven world and for European championships.
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