The Russian opposition politician Alexei Navalny – a vocal critic of President Vladimir Putin – has died, according to the prison service.

The jailed dissident was aged 47.

Russian President Vladimir Putin has been informed of his death according to the state news agency TASS.

Latest updates: Jailed Putin critic Alexei Navalny has died

Russia’s Investigative Committee has launched a procedural probe, it said.

The Federal Penitentiary Service for Yamal said in a statement: “On 16 February, 2024, in penal colony No 3, convict AA Navalny felt unwell after a walk, almost immediately losing consciousness.

“The facility’s medical workers immediately arrived at the scene and an emergency medical team was called in.

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“All necessary resuscitation measures have been carried out, but they did not yield positive results.

“Emergency medics confirmed the death of the convict.

“The causes of death have been established.”

Nobel Peace Prize winner and campaigning journalist Dmitry Muratov, who is editor-in-chief of Russia’s most famous independent newspaper, Novaya Gazeta, described the death of Mr Navalny as “murder” and said he believed prison conditions had led to his demise.

Sky News’ Moscow correspondent Diana Magnay said: “It’s appalling. It’s an absolute tragedy and it’s a stain on the conscience of the Russian state.

“His health has been deteriorating… he has been held in solitary confinement for much of the time since he was imprisoned after his return to Russia in January 2020.

“But it does seem very shocking that his health should have deteriorated to the extent that he’s dead now – given we have seen him in court videos, we have also had a lot social media presence from him via his lawyers where he is constantly seen upbeat and cheerful.

“Yes, he’s been put through a lot by the prison systems but we have not had an indication that he would die this suddenly, so I just wonder if something specific happened to him.”

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