Alexei Navalny was set to be freed as part of a prisoner swap when he died, one of his allies has claimed.
The Russian opposition leader died at a penal colony within the Artic Circle on 16 February, while serving a 19-year prison sentence on charges his supporters said were politically motivated.
It has now been claimed that the prisoner-swap talks were in their “final stages” when Mr Navalny died.
In a video posted on the late Kremlin critic’s YouTube channel, Maria Pevchikh – who lives outside Russia – said: “Alexei Navalny could have been sitting here now, today. It’s not a figure of speech.”
Ms Pevchikh said she received confirmation about the talks just one day before Mr Navalny’s death was announced.
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She claimed that Putin “wouldn’t tolerate” Navalny being freed and decided to “get rid of the bargaining chip”. She has not offered evidence to back up the allegation.
The circumstances of Mr Navalny’s death remain unclear – but several world leaders, including Joe Biden, have directly blamed Vladimir Putin and the Russian government.
Mr Navalny’s widow Yulia Navalnaya has also pointed the finger at the Russian president, claiming her husband could have been poisoned with novichok.
The Kremlin has repeatedly denied any involvement in his death.
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Ms Pevchikh said Mr Navalny and two US citizens held in Russia, whom she has not identified, were supposed to be swapped for Vadim Krasikov.
Krasikov is serving a life sentence in Germany for the 2019 killing of Zelimkhan “Tornike” Khangoshvili, a 40-year-old Georgian citizen of Chechen descent.
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There are several US citizens in custody in Russia, including Wall Street Journal reporter Evan Gershkovich, who was arrested on espionage charges, and Paul Whelan, a corporate security executive from Michigan, convicted of espionage.
Both men and the US government dispute the charge.
When asked about the swap claim at a regular news conference in Berlin, German government spokesperson Christiane Hoffmann said she could not comment.