The retaliation, "guided by the reciprocity principle," comes after Germany expelled two Russian diplomats last week. The tussle stems from a killing in Berlin that Germany has linked to the Kremlin.
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.
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.