Alexei Navalny, the fiercest foe of Russian President Vladimir Putin who crusaded against official corruption and staged massive anti-Kremlin protests, died in prison on Friday, Russia’s prison agency said.
Mr Navalny was 47.
The federal prison service said in a statement that Mr Navalny felt unwell after a walk on Friday and lost consciousness.
An ambulance arrived to try to rehabilitate him, but he died.
There was no immediate confirmation of Mr Navalny’s death from his team.
Navalny, who was serving a 19-year sentence on charges of extremism, was moved in December from his former prison in the Vladimir region of central Russia to to a “special regime” penal colony – the highest security level of prisons in Russia – above the Artic Circle.
His allies decried the transfer to a colony in the town of Kharp, in the Yamalo-Nenets region about 1,200 miles north-east of Moscow, as yet another attempt to force Mr Navalny into silence.
The remote region is notorious for long and severe winters.
Kharp is about 60 miles from Vorkuta, whose coal mines were part of the Soviet gulag prison-camp system.
Mr Navalny had been behind bars since January 2021, when he returned to Moscow after recuperating in Germany from nerve agent poisoning that he blamed on the Kremlin.
Before his arrest, he campaigned against official corruption, organised major anti-Kremlin protests and ran for public office.
He had since received three prison sentences, all of which he rejected as politically motivated.
More to follow
Associated Press