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Imprisoned Russian opposition activist Vladimir Kara-Murza has been moved to a maximum-security prison in Siberia weeks after being taken from a detention center in Moscow, the BBC reports.
He was placed in an isolation cell at a prison colony in Omsk, his lawyer said.
Mr Kara-Murza, who survived two poisonings since 2015, was sentenced to 25 years in prison in April on charges of treason and lying about the war in Ukraine.
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His lawyer said conditions in Omsk, which is about 2,700 km from Moscow, threatened his client’s health.
The 42-year-old’s whereabouts were unknown in recent weeks.
Kara-Murza was convicted for his speech before the Arizona House of Representatives, in which he condemned Russia’s invasion of Ukraine under a law passed after the war began.
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His sentence is the longest against a Russian opposition figure in recent years.
According to his lawyer, Vadim Prokhorov, Kara-Murza was placed in solitary confinement immediately after his arrival at the penal colony last week.
In a post on Facebook, Prokhorov warned that it was dangerous for his client, whose health had weakened due to poisoning attempts, which his client blamed on the Kremlin. As a result, Kara-Murza developed a nerve disease called polyneuropathy.