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Russian dissident Vladimir Kara-Murza, who was jailed after criticising President Vladimir Putin and the war in Ukraine, has been taken to a prison hospital, his wife says.

Evgenia Kara-Murza said on X that officials refused to comment on his condition when his lawyers tried to visit him.

Last year Mr Kara-Murza, a dual Russian-British citizen, was jailed and transferred to a prison colony in Siberia.

His wife says he suffers from a neurological condition as a result of poisonings.

Mr Kara-Murza, 42, has accused Russian authorities of trying to poison him in 2015 and 2017.

On Friday, lawyers for the dissident arrived at the Omsk prison colony but were not told where he was for five hours and then not permitted to visit him in hospital, Evgenia Kara-Murza says.

The outspoken critic of the Kremlin was arrested in April 2022.

In 2023 he was sentenced to 25 years for spreading "false" information about the Russian army and being affiliated with an "undesirable organisation".

He has criticised President Vladimir Putin over the Russian government's crackdown on dissent and the war in Ukraine.

He had also played a key role in persuading Western governments to sanction Russian officials for human rights abuses and corruption.

The US state department has described Mr Kara-Murza as "yet another target of the Russian government's escalating campaign of repression".

Mr Kara-Murza, who comes from a Soviet dissident family, received British citizenship when he moved to the UK as a teenager with his mother.

His wife has expressed concern over his wellbeing while in prison, particularly following the death of opposition leader Alexei Navalny earlier this year.