"Biological material" has been taken abroad and tested in two different countries, she writes.
The regime critic Aleksey Navalny died under unclear circumstances in a Russian penal colony in the Arctic Ural Mountains in early 2024, while serving a lengthy sentence. Russian authorities have claimed that he died a natural death due to several illnesses, information that Julia Navalnaya has dismissed as lies.
Medical experts have previously stated that Navalny's symptoms have indicated that he was poisoned.
His widow Julia Navalnaya has urged continued struggle for a free and peaceful Russia from her exile in Germany.
