Russian MPs voted on Tuesday to pass the first reading of a bill that would ban members of “extremist” organisations from elections - a move which could pave the way to prevent allies of Alexei Navalny from standing for office.
Looking gaunt with a shaved head and blue penal uniform, Navalny confirmed he had resumed eating and said he now weighs 72 kilograms.
"I weighed this much in seventh grade," the 44-year-old said.
Earlier this month, the Moscow prosecutor's office had asked the court to declare FBK as an extremist group and its staff as extremists.
Imprisoned Kremlin critic Alexei Navalny said he felt "pride and hope" after learning about the mass protests held across Russia on Wednesday.
Vladimir Putin delivered an annual address ahead of planned pro-Navalny protests.
Imprisoned Russian opposition leader Alexei Navalny says officials have threatened to force-feed him and end the hunger he started on March 31.
The 44-year-old announced last month he was going to begin refusing food in a bid to get proper medical treatment.
Navalny likened his detention conditions to "Orwell's 1984" in an Instagram post on Monday.
Russian police arrested around 200 opposition politicians and municipal deputies at a Moscow conference.