FILE - In this Saturday, Feb. 20, 2021 file photo, Russian opposition leader Alexei Navalny stands in a cage in the Babuskinsky District Court in Moscow, Russia. Russian opposition leader Alexei Navalny described tight controls at his prison in a letter posted Monday March 15, 2021, saying they include hourly checks during the night. 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 (53 miles) east of Moscow, which stands out among Russian penitentiary facilities for its particularly strict regime. (AP Photo/Alexander Zemlianichenko, File)
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