Aides to Russian opposition politician Alexei NavalnyАлексѐй Anatolyevich Navalny (Russian: Алексей Анатольевич Навальный) expressed concerns about the health of the 47-year-old Kremlin critic.
Navalny's team has been unable to contact him for five days. Navalny is in a penal colony.
On Friday, Navalny's team said it was deeply concerned about his health and survival after no video communication was made to the opposition activist during a court hearing.
Navalny's lawyers have been trying to contact him for five days, but Russian authorities have denied them access.
Navalny's team said the Russian prison administration explained that a power outage was the reason for the lack of a video link.
Russian court extends arrest of three Navalny lawyers
Letters to and from Navalny have not been received in a week, according to his associates.
Navalny was imprisoned in a prison colony in the city of Kovrov, Vladimirovo Oblast, 260 kilometers east of Moscow. The opposition leader was sentenced to 19 years in prison on charges deemed contrived by the international community and is considered a political prisoner.
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