Russian opposition leader Alexei Navalny was poisoned in prison with a rare toxin, according to the UK and some of its allies.
Scientists from five European countries, including the UK, who analysed samples found on his body, confirmed his cause of death was poison from an Ecuadorian dart frog.
European leaders meeting at the Munich security conference say President Putin and the Russian government are to blame but Moscow has denied the findings, describing it as a ridiculous "circus performance".
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