- Russia prison service insisted that Alexei Navalny was in "satisfactory" condition.
- Navalny allies reported that his health was deteriorating in a penal colony notorious for harsh discipline.
- He is a fierce critic of Russia President Vladimir Putin.
Russia's prison service said Thursday that jailed opposition figure Alexei Navalny was in "satisfactory" condition after allies reported his health was deteriorating in one of Russia's most notorious prisons.
The prison service told Russian news agencies that medics had carried out a check on Navalny on Wednesday and that "according to the results of the examination, his state of health was assessed as stable and satisfactory".
Lawyers for the jailed Kremlin critic sounded the alarm over his health in prison on 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.
Western countries have slapped sanctions on Russia for jailing Navalny and also for orchestrating a poisoning attack against him in 2020.
Navalny was arrested in January on his return to Russia from Germany where he had been recovering from exposure to the Soviet-designed nerve toxin Novichok.
He is serving his sentence outside Moscow in a penal colony notorious for harsh discipline.
Navalny's allies this week launched a campaign seeking his release and announced plans to stage what they said would be "modern Russia's biggest protest".
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