I found this wikipedia page of defenestrated businessmen which will be amusing to some.
There were four FSB assassinations just recently.
https://en.wikipedia.org/wiki/Suspicious_Russia-related_deaths_since_2022

The last time that there were four assassinations in quick succession was February 2024 round the time of the battle for Avdiivka. Note that one of the killings here took place in Spain.