Supporters of imprisoned Russian opposition leader Aleksei Navalny say they have had no contact with him for three days.
Maria Pevchikh, chairwoman of Navalny's Anti-Corruption Foundation, wrote on X, formerly Twitter, on December 8 that "Navalny is missing for three days now."
"Navalny’s life is at great risk," she wrote. "He is in complete isolation now."
In a post on Instagram on December 8, Ruslan Shaveddinov, also with the Anti-Corruption Foundation, wrote that the last information about Navalny was that he had fallen ill in his cell after being subjected to harsh conditions, including limited food, a lack of ventilation, and minimal exercise time.
"Navalny's only protection is publicity," Shaveddinov wrote.
Navalny associate Kira Yarmysh wrote on X on December 8 that the opposition leader's lawyers had waited outside the prison all day without being granted permission to visit their client.
She said his allies had not received any letters from him for more than a week, which she said was unusual.
"Our letters to him also have not been delivered," she wrote.
On December 8, Navalny was not connected by video link to a court hearing, with prison officials citing technical problems.
On December 7, Navalny's supporters launched a campaign to oppose President Vladimir Putin's bid to secure a fifth presidential term in Russia's March 2024 election. Navalny has urged Russians to vote against Putin in the election. Putin announced on December 8 that he will seek another term.
Navalny is serving a 19-year prison term after being convicted of creating an "extremist" organization, charges that are widely believed to be retribution for his political activity. In September, he was transferred to a strict-regime cell after being deemed "incorrigible."
He has been placed in solitary confinement more than 20 times since he began his prison term in February 2021.
He has been recognized as a prisoner of conscience by Amnesty International and as a political prisoner by the Memorial human rights group.