Most recently, it was alleged that Abramovich was involved in negotiating a prisoner exchange that would have freed Alexey Navalny before his death.
Alexey Navalny, Putin's political nemesis, died suddenly on February 16.
Before his death, Navalny was being held at an Arctic penal colony which many viewed as a punishment for his opposition to Putin and the Kremlin.
While the Kremlin denied any involvement in his death, world leaders, commentators, and Navalny's family have publicly blamed Putin.
Speaking in a video posted to YouTube, Maria Pevchikh — an anti-corruption activist who was one of Navalny's allies — said that Navalny was close to being released as part of a prisoner exchange that was being negotiated the day before his death.
"Roman Abramovich was the one who delivered the proposal to swap Navalny to Putin. As an informal negotiator communicating with American and European officials, and at the same time, representing Putin; an unofficial channel of communication with the Kremlin," she said.
Pevchikh noted that she contacted Abramovich through mutual acquaintances to ask for more details about the alleged negotiations. She said that although he didn't respond, he did not deny the allegations. Editor's note: This story was originally published on September 1 2023 and most recently updated on February 26 2024 to include details about Roman Abramovich's alleged role in mediating a prisoner swap to release Alexey Navalny.