The what is known, but the how may never be clear. It is the why that is already the largest question, after the untimely death of Alexey Navalny. We don’t know whether the Kremlin had a hand in his death, but they certainly failed in their duty of care of their most famous prisoner.

https://edition.cnn.com/2024/02/16/europe/alexey-navalny-death-analysis-intl-cmd/index.html