>> The whole point of using biological weapons like these is that it's almost impossible to prove that poisoning actually took a place. No one would ever find out for sure if he would die and only reason he still alive is few lucky conditions.

I've read your post and realized that, though not affiliated with the country in any way, even I know a few Putin's opponents who died somewhat unexpectedly. A blogger Anton Nosik comes to mind. Can it be that killings are more common than we think?