Russian opposition leader Alexei Navalny has been jailed for 15 days for resisting police orders during an anti-government protest.
Tens of thousands of people took to the streets in cities across Russia on Sunday in the biggest sign of defiance since protests in 2011 and 2012.
The protests come a year before Russia's presidential elections where Vladimir Putin is expected to stand for a fourth term.
More than a thousand people were detained along with Mr Navalny during the protest in Moscow, and hundreds more were held in cities across the country.
Mr Navalny was earlier fined 20,000 rubles ($350) for his role in organising the event.