Last week the 44-year-old opposition politician, said he was suffering from a pinched nerve that had caused his right leg to go numb

Navalny, who is considered a flight risk by authorities, said last week that he is woken eight times per night by guards announcing to a recording camera that he is still in his cell

Jailed Kremlin critic Navalny announces hunger strike

Conditions at the facility have been thrust into the spotlight as Navalny has accused its guards of waking him every hour during the night as a flight risk, and of denying him proper treatment for acute back and leg pain

A general view shows Penal Colony No 2, where opposition leader Alexei Navalny is serving a jail term, in the town of Pokrov, Russia February 28, 2021.

Prison holding Kremlin critic Navalny boosts surveillance

President Vladimir Putin's most prominent critic is serving a two-and-a-half-year sentence on old embezzlement charges

Navalny, 44, said that in the past four weeks he had received 10 formal reprimands from prison authorities, including six from guards at his current prison in the town of Pokrov outside the Russian capital

Navalny says risks solitary confinement in Russian prison

Navalny was jailed last month for two and a half years on charges he called politically motivated

Russian opposition leader Alexei Navalny and his wife Yulia Navalnaya are seen on board a plane during a flight from Berlin to Moscow, January 17, 2021.

Kremlin dismisses call from Navalny's wife to free jailed critic for medical reasons

Lawyers for the jailed Kremlin critic sounded the alarm over his health in prison Wednesday, demanding immediate access, saying he had complained of back pain and leg numbness

Navalny was jailed in February for two-and-a-half years on old embezzlement charges in a move his allies said was a pretext to silence his criticism of Russian leader Vladimir Putin

Russia prison service says Navalny's health 'satisfactory'

He was jailed earlier this year for parole violations in a decision that the West has condemned as politically motivated

Russian opposition politician Alexei Navalny takes part in a rally in Moscow, Russia, February 29, 2020.

Kremlin critic Navalny's Instagram account confirms he is being held in a prison camp in Vladimir region

He was jailed for parole violations in a decision that the West has condemned as politically motivated.

Russian opposition politician Alexei Navalny attends a hearing to consider an appeal against an earlier court decision to change his suspended sentence to a real prison term, in Moscow, Russia February 20, 2021.

Kremlin critic Navalny moved from jail; TASS says he is now in penal colony

Ties between Moscow and the West hit new lows over the poisoning and jailing of Kremlin critic Alexei Navalny

Russian President Vladimir Putin and German Chancellor Angela Merkel hold a joint news conference in the Kremlin in Moscow, Russia, January 11, 2020.

Germany is main target of Russian disinformation

The State Department did not immediately respond to a request for comment on the possibility of sanctions

Exclusive: U.S. sanctions for Navalny poisoning may come on Tuesday

His whereabouts had been unknown since Thursday

Navalny, 44, was arrested on his return from Germany last month and has been sentenced to more than 2-1/2 years for parole violations that he said were trumped up

Kremlin critic Navalny moved to penal colony outside Moscow to serve jail term

European foreign ministers are expected to agree on Monday to impose sanctions on allies of Russian President Vladimir Putin

Kremlin critic Alexei Navalny, who is accused of slandering a Russian World War Two veteran, stands inside a defendant dock during a court hearing in Moscow, Russia, Russia February 20, 2021, in this still image taken from video

Only 'language of power' and sanctions can free Navalny, ally says

The ECHR said its decision to demand Navalny’s release was motivated by a possible risk to his life

Kremlin critic Alexei Navalny, who is accused of slandering a Russian World War Two veteran, is seen inside a defendant dock during a court hearing in Moscow, Russia, Russia February 16, 2021, in this still image taken from video

Russia dismisses European Court of Human Rights' call to free Navalny

President Vladimir Putin's most vocal opponent was taken into police custody immediately after returning to Moscow in January

In his closing arguments, Navalny said that "every moment of this case is obvious legal nonsense"

Prosecutor seeks defamation fine in latest Navalny case

The West has fiercely condemned Navalny's arrest in mid-January

Police confront protesters during a demonstration in support of jailed Russian opposition leader Alexei Navalny, Moscow, January 23, 2021.

Russia expels EU diplomats over Navalny protests, ties at 'low point'

The move came just days after Russian President Vladimir Putin's most prominent critic was sentenced to nearly three years in prison

Walesa won the Nobel Peace Prize in 1983 for his leadership of the Solidarity labour movement that brought a peaceful end to communism in Poland

Poland's Walesa nominates Kremlin critic Navalny for Nobel

The Norwegian Nobel Committee, which decides who wins the award, does not comment on nominations, keeping secret for 50 years the names of nominators and unsuccessful nominees

Navalny and Tanberg are among the nominees for the Nobel Prize

Jailed Kremlin critic Navalny announces hunger strike

Prison holding Kremlin critic Navalny boosts surveillance

Navalny says risks solitary confinement in Russian prison

Kremlin dismisses call from Navalny's wife to free jailed critic for medical reasons

Russia prison service says Navalny's health 'satisfactory'

Kremlin critic Navalny's Instagram account confirms he is being held in a prison camp in Vladimir region

Kremlin critic Navalny moved from jail; TASS says he is now in penal colony

Germany is main target of Russian disinformation

Exclusive: U.S. sanctions for Navalny poisoning may come on Tuesday

Kremlin critic Navalny moved to penal colony outside Moscow to serve jail term

Only 'language of power' and sanctions can free Navalny, ally says

Russia dismisses European Court of Human Rights' call to free Navalny

Prosecutor seeks defamation fine in latest Navalny case

Russia expels EU diplomats over Navalny protests, ties at 'low point'

Poland's Walesa nominates Kremlin critic Navalny for Nobel

Navalny, WHO and Thunberg among nominees for Nobel Peace Prize

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Jailed Kremlin critic Navalny announces hunger strike

Prison holding Kremlin critic Navalny boosts surveillance

Navalny says risks solitary confinement in Russian prison

Kremlin dismisses call from Navalny's wife to free jailed critic for medical reasons

Russia prison service says Navalny's health 'satisfactory'

Kremlin critic Navalny's Instagram account confirms he is being held in a prison camp in Vladimir region

Kremlin critic Navalny moved from jail; TASS says he is now in penal colony

Germany is main target of Russian disinformation

Exclusive: U.S. sanctions for Navalny poisoning may come on Tuesday

Kremlin critic Navalny moved to penal colony outside Moscow to serve jail term

Only 'language of power' and sanctions can free Navalny, ally says

Russia dismisses European Court of Human Rights' call to free Navalny

Prosecutor seeks defamation fine in latest Navalny case

Russia expels EU diplomats over Navalny protests, ties at 'low point'

Poland's Walesa nominates Kremlin critic Navalny for Nobel

Navalny, WHO and Thunberg among nominees for Nobel Peace Prize