To all the people in this thread saying this was probably an accident:
Imagine you’re an operator inside a totalitarian regime, and you want someone assassinated. Maybe this person isn’t themself a critical target, your objective is to instill fear in a particular department to increase compliance on a morally abhorrent skunkworks project. You already know everything about this person, of course including details of their personal life and hobbies. Hey they’re a mushroom hunter. Mycotoxins are readily available and can be lethal in small, undetectable doses. Not difficult to figure out what happens from there. Everyone who knows Vitaly knows, hey he wouldn’t pick and eat a poisonous mushroom. The message is sent to the people who you want to hear it.