Russian opposition leader Alexei Navalny duped a Russian FSB state agent into revealing details of an attack on him with the nerve agent Novichok, the investigative group Bellingcat reports.

Mr Navalny reportedly impersonated a security official to call the agent.

The agent, Konstantin Kudryavtsev, told him the Novichok had been placed in a pair of Mr Navalny's underpants.

Mr Navalny, who is still recovering in Berlin, posted a recording of the long conversation on his YouTube channel.

He collapsed on board a Russian airliner in August in the attack, which nearly proved fatal.

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