Thousands gathered at a rally in Moscow commemorating the murdered Russian opposition leader Boris Nemtsov.
Demonstrators marched through the centre of Moscow, crossing over the bridge near the Kremlin where the politician was shot dead.
ITV News Europe Editor James Mates reports:
A car suspected of being used by the killers of Russian opposition politician Boris Nemtsov has been found abandoned in central Moscow.
Some Russian news agencies claimed CCTV footage showed two men leaving the vehicle.
This video shows security personnel bundling a man who may have been a protester into a police van at the anti-government demonstrations in Moscow.
The US State Department has said that the sentencing and jailing of Navalny brothers in Russia is 'a disturbing development designed to punish and deter political activism'.
Russian opposition leader Alexei Navalny was detained by police after breaking house arrest on Tuesday to join an opposition rally in Moscow. "I was detained," Navalny said on his Twitter account. "But they won't be able to detain everyone".
The Progress Party of St Petersburg has tweeted pictures which appear to show the protest.
Russian opposition leader Alexei Navalny has been detained by police after joining rally in Moscow, according to the Interfax news agency.
Putin critic Alexei Navalny said he broke his house arrest on Tuesday to join an opposition rally in Moscow, hours after a Russian court sentenced him for embezzlement.
"Yes, there is this house arrest. But today I want to be with you. So I'm coming," said Navalny said on his Twitter feed, posting a picture of himself in the Moscow metro. A Russian court gave Navalny a suspended sentence on Tuesday for embezzling money but jailed his brother for three and a half years in a case seen as part of a campaign to stifle dissent. Navalny's supporters will gather in front of the Kremlin later on Tuesday with some 18,000 people having registered on Facebook to attend although the numbers may be smaller as people prepare to celebrate the New Year.
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Russian President Vladimir Putin has extended his condolences to the family of Christophe de Margarie, who died in a plane crash late last night in an airport in Moscow.
The chief executive of French oil giant Total regularly travelled to Russia, and recently dined in Paris with an ally of President Putin, who is under EU sanctions. Mr Putin's spokesman said:
Vladimir Putin had known de Margerie for a long time and had maintained close working contact with him.
The president highly valued the business qualities of de Margerie, as well as his staunch commitment both to the cause of promoting Russian-French relations and their mutually beneficial diverse co-operation in general.
French President Francois Hollande expressed his "stupor and sadness" at the news.