Thousands of protesters are demanding the release of Alexei Navalny, the country's top opposition figure.
Police have arrested hundreds of pro-Navalny supporters attending the nationwide protests.
Navalny was detained on 17 January after he flew back to Moscow from Germany.
Russian authorities had promised a tough crackdown prior to the protests.
Report by Shoulderg.
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Police ramp up pressure on opposition with arrests and criminal probes as Navalny allies gather for new protests.
Supporters of jailed opposition leader Alexey Navalny demand his release, defying bitter cold and a ban on protests.
