Moscow: Russian opposition leader Alexei Navalny described tight controls at his prison in a letter posted on Monday. Navalny’s note posted on his Instagram page confirmed for the first time that he arrived at a prison colony in Pokrov in the Vladimir region, 85 kilometers i.e., 53 miles east of Moscow.

Navalny, whom prison authorities marked as a flight risk, said he’s subject to particularly close oversight that includes a guard waking him up every hour at night and filming him to report that he’s in place.

I calmly go back to sleep with a thought that there are people who remember about me and will never lose me, he said with a touch of his trademark sardonic humor, adding that the prison is rigged with CCTV.

“      I must acknowledge that the Russian prison system has managed to surprise me.” He said that the prison regimen is rigorously observed and prisoners meticulously follow the rules.