Lyubov Sobol's tenacity in standing up to the authorities, combined with a savvy use of social media, has put her at the center of attention as a new protest leader.
Navalny, a longtime critic of President Vladimir Putin, was recently arrested after calling for a mass protest in Moscow.
Demonstrators are demanding fair elections for the City Duma and for opposition candidates to be allowed on the ballot.
Video showed the Aeroflot flight's rocky emergency landing, as the jet bounced along the runway before its rear portion was engulfed in flames. It's unclear why it turned around shortly after takeoff.
The brother of Paul Whelan, the American arrested in Moscow in late December, says Russia has given the family no information for why he is being accused of spying.
"A library can be a loud place," says a city official in charge of Moscow's 400-plus public libraries, which have begun attracting visitors with coffee shops, theater rehearsals and lectures.
Whelan was born in Canada and has since gained citizenship in the U.S., Britain and Ireland.
Russia says Paul Whelan was detained on Friday while on a spy mission. He faces up to 20 years in prison if convicted on espionage charges.
The move comes at a time of heightened tensions between Russia and Ukraine, and has already drawn condemnation from Moscow.
A lawyer attending the "Return of the Names" event said it was a rare occasion to express discontent with Russia's present government.