FILE - Russian opposition activist Vladimir Kara-Murza gestures while standing in a glass cage in a courtroom during the announcement of the verdict on appeal at the Moscow City Court on July 31, 2023. Kara-Murza was convicted of treason last year over a speech denouncing the war in Ukraine. He is serving a 25-year prison term in a Siberian prison colony, the stiffest sentence for a Kremlin critic in modern Russia. (AP Photo, File)
FILE - Ilya Yashin, a Russian opposition activist and former municipal deputy of the Krasnoselsky district, gestures and smiles as he stands in a defendant's cubicle in a courtroom prior to a hearing in Moscow, on Dec. 9, 2022. Most Russian opposition figures are currently either in prison or in exile abroad. Still, many persist in challenging the Russian authorities, including by speaking out from behind bars. (Yury Kochetkov/Pool via AP, Pool, File)
FILE - Oleg Orlov, the co-chair of the Nobel Peace Prize-winning human rights organization Memorial, gestures while standing in a glass cage after he was taken into custody in the courtroom during a court session for a new trial on charges of repeated discrediting the Russian military, in Moscow on Tuesday, Feb. 27, 2024. (AP Photo, File)
FILE - Russian opposition leader Alexei Navalny, center, attends a rally in Moscow on Sunday, Jan. 28, 2018. During his 24-year rule, Russian President Vladimir Putin has gone from tolerating dissent to suppressing any challenger. Most Russian opposition politicians are in prison or exile. (AP Photo/Evgeny Feldman, File)
FILE - Andrei Pivovarov, the former head of the Open Russia movement, stands behind glass during a court session in Krasnodar, Russia, on June 2, 2021. Pivovarov, serving four years for running a banned political organization, must clean his solitary cell for several hours a day and listen to a recording of prison regulations, says his wife, Tatyana Usmanova. (AP Photo, File)
FILE - Lilia Chanysheva makes a heart gesture as she stands in a cage during a hearing in Kirovskiy District Court in Ufa, Russia, on Wednesday, June 14, 2023. Chanysheva, who used to head imprisoned opposition leader Alexei Navalny's office in the Russian region of Bashkortostan, was convicted of extremism charges and sentenced to 7.5 years in prison. (AP Photo, File)
FILE - Alexei Gorinov holds a sign "I am against the war" standing in a cage during hearing in the courtroom in Moscow, Russia, Tuesday, June 21, 2022. Gorinov, a former member of a Moscow municipal council serving seven years for speaking against the war in Ukraine, suffers from a chronic lung condition. His health deteriorated during six weeks in solitary confinement, and he is still recovering. (AP Photo, File)