Russian opposition politician Alexei Navalny confirmed Wednesday that he was transferred to another prison and is in quarantine.

Navalny wrote on the Telegram messaging app that he was moved to the maximum security IK-6 prison in the Vladimir region village of Melekhovo, about 250 kilometres east of Moscow.

Navalny, the most determined political foe of Russian President Vladimir Putin, previously was held at the IK-2 penal colony in the Vladimir region. The facility in the town of Pokrov stands out among Russian penitentiaries for its especially strict inmate routines, which include standing at attention for hours. IK-6 is located about 150 kilometres