Inadvertent or deliberate humor? [View all]

[Lord Ludd]

Moscow (CNN) - A Russian agent sent to tail opposition leader Alexey Navalny has revealed how he was poisoned in August -- with the lethal nerve agent Novichok planted in his underpants.

The stunning disclosure from an agent who belonged to an elite toxins team in Russia's FSB security service came in a lengthy phone call following the unmasking of the unit by CNN and the online investigative outfit Bellingcat last week.

In what he was told was a debriefing [italics mine], Konstantin Kudryavtsev also talked about others involved in the poisoning in the Siberian city of Tomsk, and how he was sent to clean things up.