Russian opposition leader Alexei Navalny was poisoned by deadly 'dart frog' toxin, Europeans say

Russian opposition leader Alexey Navalny in court in Moscow in 2019. Russian opposition leader Alexei Navalny died in prison after being poisoned with a deadly toxin found in Ecuadorian dart frogs, the U.K. and other allies claimed Saturday Russian opposition leader Alexei Navalny died in prison after being poisoned with a deadly toxin found in Ecuadorian dart frogs, the U.K. and other allies claimed Saturday