Russian Opposition Leader Killed Using Dart Frog Toxin

Russian opposition leader Alexei Navalny was killed using a poison developed from a dart frog toxin, the UK and European allies have said.

Two years on from the death of Navalny at a Siberian penal colony, Britain and its allies have blamed the Kremlin following analysis of material samples found on his body.

According to Tass news agency Moscow has dismissed the finding as "an information campaign."

- Authors: Adam Goldsmith and Tom McArthur, BBC