At least 112 people were arrested while the hearing was taking place, and days after more than 5,000 people were detained across the country for protesting in support of Navalny, according to the independent OVD-Info protest monitoring group. "I've offended him so deeply by the fact that I've survived", Navalny charged. More than 300 have been detained.
While the trigger for those protests was Navalny's arrest, some protesters say they have also taken to the streets to vent their frustration over declining living standards.
The Kremlin has denied that Navalny's detention is political or that is has any involvement in his poisoning. Several people faced criminal charges over alleged violence against police. Less than a minute later, a police officer took her away.
The protests, which saw authorities enforce an unprecedented lockdown of the centre of Moscow, came ahead of a high-profile court hearing that could see Navalny imprisoned for several years.
Arsen Bilalov, a 42-year-old teacher, had traveled nearly 2,000 kilometers from his hometown of Makhachkala in the southern Russian republic of Dagestan, where he had already been briefly detained for protesting on January 23. "I'm urging all not to be afraid".
Demonstrations in his support have been attended not just by Russians demanding his release, but also by those angry at falling living standards who were spurred on by an investigation Navalny released after his arrest claiming that Putin owns an opulent billion-dollar palace on the Black Sea coast. The video has been viewed over 100 million times, fueling discontent as ordinary Russians struggle with an economic downturn, the coronavirus pandemic and widespread corruption during Putin's years in office.
Pro-Kremlin media have since been allowed to tour the palace and a childhood friend and former judo sparring partner of Putin, the oligarch Arkady Rotenberg, over the weekend appeared in a report claiming he owned the building and meant to turn it into an apartment hotel.
The jailing of Navalny and the crackdown on protests have stoked global outrage.
British Foreign Secretary Dominic Raab said the "perverse ruling, targeting the victim of a poisoning rather than those responsible, shows Russian Federation is failing to meet the most basic commitments expected of any responsible member of the worldwide community".
Kremlin spokesman Dmitry Peskov has responded by saying the case is a "domestic affair" and that "we will not allow anyone to interfere in it".
"A Russian citizen sentenced by Russian court in accordance with Russian laws". More than a dozen countries - including Canada, the United States and Britain - and the European Union had diplomatic representatives in the courtroom Tuesday.
Foreign Ministry spokeswoman Maria Zakharova said on Facebook the diplomats' presence "isn't just meddling in the internal affairs of a sovereign state, but the self-incrimination of the west's unsightly and illegal attempts to contain Russian Federation".
"We are ready to patiently explain everything, but we aren't going to react to mentor-style statements or take them into account", Peskov said in a conference call with reporters.
"The Russian government makes a big mistake if it believes that this is about us", he told NBC News.
Jim Heintz in Moscow and Jill Lawless in London contributed.