Russia announced Alexei Navalny s death on 16 February, prompting UK to freeze assets of six Russian prison bosses linked to the Arctic penal colony where Navalny was held.
Alexei Navalny, the fiercest critic of Russian president Vladimir Putin, died in prison Friday, according to media reports citing Russian prison officials.
Navalny, who was known to be a fierce critic of Russian President Vladimir Putin, was serving a 19-year jail term. He was moved to Arctic penal colony, which is considered to be one of the toughest prisons, located in a region that is notorious for long and severe winters.