Alexei Navalny

Updated at 3:00 p.m. ET

Protests have gripped Russia for a second weekend in a row, as thousands ignored warnings of a mass crackdown and returned to the streets Sunday to once again demand the release of jailed opposition leader Alexei Navalny.

Russian opposition leader Alexei Navalny called on his supporters to protest after he was arrested at a Moscow airport Sunday.

"Don't be afraid. Take to the streets. Don't do it for me, do it for yourselves and your future," Navalny said in a video posted to YouTube, the social media platform that has brought his anti-Kremlin message to the farthest corners of Russia. Navalny's supporters say they will organize nationwide protests on Jan. 23.

Updated at 10:20 a.m. ET

In his marathon year-end news conference, Russian President Vladimir Putin projected confidence and defiance on a range of issues — and vehemently denied government involvement in the recent poisoning of Russian opposition leader Alexei Navalny.

On Thursday, Putin appeared during the latest iteration of a Q-and-A that regularly tops four hours, which he has led for nearly two decades running.

City authorities in Moscow are rolling out new digital "social monitoring" tools targeting the public, after what officials say were constant violations of the city's quarantine imposed this week to fight the spread of the new coronavirus.

Under restrictions in place since Monday, most of the city's 12 million residents must remain indoors, barring a few exceptions — like trips to the supermarket or pharmacy, taking out the trash or briefly walking the dog.