Russia’s most prominent surviving dissident has been transferred from a maximum security prison in Siberia to a prison hospital, deepening fears that his life may be in danger. Vladimir Kara-Murza, who holds dual Russian and British citizenship, was transferred to the hospital in Omsk on Thursday, his wife told news agencies. Kara-Murza is a journalist and filmmaker who’s won a Pulitzer prize for columns published in the Washington Post on the tyranny of the Putin regime – run, he says, by murderers. At 42 he has been poisoned twice and jailed for 25 years on bogus treason charges, after a trial he said recalled those of Russia under Stalin in the 1930s. William Browder, the US financier and campaigner behind the Magnitsky anti-corruption acts now in force in several jurisdictions, says one of Kara-Murza’s difficulties now is his British passport, since as things stand the UK does not negotiate for hostages.