Imprisoned Russian dissident Alexey Navalny has been transferred into a solitary prison cell, according to tweets from himself and his staff, in what he described as a move designed to “shut me up.”Navalny, a prominent critic of Russian President Vladimir Putin, explained what happened in a Thursday Twitter thread: “Congratulations, I’ve moved up one more level in the hierarchy of prison offenders,” Navalny wrote with irony, adding that prison officials moved him to a cramped “cell-type room.”Cell-type rooms are used as punishment or to separate the most dangerous offenders in the Russian penitentiary system.In his isolation, Navalny said that he is allowed just two books and can use prison commissary, “albeit with a very limited budget.”But the “real indescribable bestiality, very characteristic of the Kremlin, which manually controls my entire incarceration,” is the blocking of visits, he said.His parents, children and wife were due to visit, but he will no longer get to see them, Navalny wrote.After a five-month stay in Germany recovering from the Novichok poisoning, Navalny last year returned to Moscow, where he was immediately arrested for violating probation terms imposed from a 2014 case.Navalny was then transferred in June from a penal colony where he was serving his term to a higher security prison facility in Melekhovo in the Vladimir Region."