Killings are definitely more common. It's difficult to attribute all the untimely deaths to FSB activities, but given they want exactly this, we probably should do the opposite.

Schekochikhin, Kara-Murza poisoning. Zhvaniya in Georgia. Yuschenko, Babchenko, Sheremet in Ukraine. Berezovsky, Perepelichny, Patarkatsishvili, Skripals, Litvinenko in UK. Tsepov, Manevitch in Putin's native Saint Petersbourg. Nemtsov, Politkovskaya, Navalny in Russia.

Also some bad guys, like Khattab, who was killed via poisoned letter.

By no means it's an exhaustive list.

Not Nosik, though. He was a well-known addict and kind of had it coming, so there's no commonly shared suspicion around this.