The Kremlin has denied using a dart frog toxin to kill Russian opposition leader Alexei Navalny in 2024. But Britain and four European allies say they have evidence that points to the use of the forbidden chemical agent. Why did the allies choose the Munich security conference to make this point? And how has Moscow responded to the claims? Gareth is joined by Hamish de Bretton-Gordon - former head of British Army’s chemical weapons unit - and defence analyst Michael Clarke to discuss whether Russia wanted the world to know how they carried out Navalny’s death and ask should the UK be ready for chemical warfare with Russia? Producer: Tom Gillespie and Emily Hulme Editor: Philly Beaumont