“Medical personnel from the institution arrived promptly, and an ambulance crew was called. All necessary resuscitation measures were carried out, but unfortunately, they did not yield positive results. The emergency medical team pronounced the convict dead. The cause of death is being investigated,” the statement added.
For years, Navalny has been the most prominent opposition figure in Russia.
With the Kremlin cracking down on all forms of dissent, Navalny was seen as the only person still capable of mobilizing Russians to participate in organized protest against the Kremlin.
In August 2020 he went into a coma after suffering a poison attack with the nerve agent Novichok in what his supporters say was a state-sponsored attempt to kill him.
But Navalny survived and, after receiving treatment in Germany, returned to Russia in 2021.
Upon arrival at Moscow’s Sheremetyevo Airport, he was immediately arrested and had been behind bars ever since