More than 1,600 people have been arrested amid mass protests across Russia over the arrest of opposition leader Alexei Navalny.
The 44-year-old, a thorn in the side of the Kremlin for years, was arrested on January 17 when he returned to Moscow from Germany, where he had spent five months recovering from a nerve-agent poisoning.
Authorities say his stay in Germany violated terms of a suspended sentence in a 2014 criminal conviction, while Navalny says the conviction was for made-up charges.
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