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She wrote that they cannot rule out that he may have been poisoned again to make his health slowly deteriorate.

He has been repeatedly put in solitary confinement for two-week stints for months, she said. The most recent stint was the 13th time he was placed in solitary confinement, according to Yarmysh.

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

She also pleaded for international attention on the situation.

\"PHOTO:
Evgenia Novozhenina/Reuters, FILE
PHOTO: Russian opposition leader Alexey Navalny is seen on a screen via a video link from the IK-2 corrective penal colony in Pokrov during a court hearing to consider an appeal against his prison sentence in Moscow, May 24, 2022.
>

Navalny's lawyers made similar claims in the spring of 2021, saying he was in grave condition.

Navalny, who barely survived a poisoning in August 2020, was sentenced to another nine years in prison in March 2022 on charges of embezzlement and contempt of court. He had been serving 2 1/2 years in prison.

The charges have been condemned as politically motivated by the United States and many other Western countries.

\"We condemn Russian authorities’ politically-motivated conviction and sentencing of opposition leader Aleksey Navalny on additional spurious charges to nine more years in a high security prison,\" Ned Price, spokesperson for the U.S. State Department, said in a statement in March 2022. \"This outlandish prison term is a continuation of the Kremlin’s years-long assault on Navalny and on his movement for government transparency and accountability.

He continued, \"Of course, Navalny’s true crime in the eyes of the Kremlin is his work as an anti-corruption activist and opposition politician, for which he and his associates have been branded 'extremists' by Russian authorities.\"

\"Navalny,\" a documentary about the Vladimir Putin critic, won the Oscar for best documentary feature last month.

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