The investigative website Bellingcat tracked down the mobile phone numbers of eight members of the FSB team that poisoned Navalny (Russian secret police apparently can’t even afford burner phones) and gave two of them to the dissident leader, who is convalescing in Germany.
Navalny called each number, pretending to be the aide to a top FSB general trying to find out what went wrong with the hit, while Bellingcat recorded the calls. One of the agents spotted the deception at once and hung up, but the other, one Konstantin Borisovich Kudryavtsev (known to his friends as ‘Blockhead’), fell for it.