According to Yarmysh, Navalny was called an ambulance on Friday after suffering acute stomach pains.

"No one treats him and they don't even tell him about the diagnosis. He has lost eight kilos in the last 15 days in the punishment cell," writes Jarmysh.

She added that there was a risk that Navalny had been poisoned in prison, which "slowly but surely deteriorated his health."

Continuously moved to punishment cell

According to his press spokesman, he repeatedly goes into the prison's punishment cell, and at short intervals.

"On Friday he was released from the punishment cell, but on Monday he was sent back there for the 13th time. One of the prison workers told Navalny that a provocation was being prepared against him," Yarmysh writes.

Imprisoned in 2021

It was over two years ago that Navalny voluntarily returned to Russia and was arrested at passport control. Since then, he has spent the majority of his time imprisoned. There are reports that his health is constantly deteriorating and that he is being denied treatment.

Find out who Alexei Navalny is in the clip below.

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He has been described as the man Putin fears most. But who is Alexei Navalny? Photo: TT