Yulia Navalnaya was also detained at a similar protest in support of her husband last week. (File)
Russian police detained Yulia Navalnaya, the wife of jailed Kremlin critic Alexei Navalny, at an unauthorised protest in Moscow on Sunday, Navalny's allies said on social media.
OVD-Info, a monitoring group, said that more than 300 people had already been detained at the Moscow rally.
Navalnaya was also detained at a similar protest in support of her husband last week.
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