Poison dart frogs have fascinated researchers. Now their toxin has allegedly been linked to the death of Russian opposition leader Alexei Navalny.

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 ...

European leaders said they are confident Navalny was poisoned with a toxin found in South American poison dart frogs.

LONDON — Five European nations say Russian opposition leader Alexei Navalny was poisoned with a lethal toxin, and are blaming ...

The toxin was found in the body of the Russian dissident Aleksei A. Navalny, who died in prison two years ago, five governments said, challenging Russia’s official account.

The governments of five European countries on February 14 released a statement saying that they are confident that the ...

The dissident was killed while in Russian custody by a substance that doesn’t occur naturally in Russia, according to the joint investigation.

Russian opposition figure and outspoken Kremlin critic Alexey Navalny, who died two years ago, was killed while in prison by a lethal toxin found in poison dart frogs in South America, five European ...

Alexei Navalny, the Russian opposition leader, died from a 'dart frog toxin,' the UK Foreign Office announced.

Russia “had the means, motive and opportunity to administer this poison" to Navalny, a joint statement from five European ...

In a joint statement, the foreign ministries of the U.K., France, Germany, Sweden and the Netherlands say Navalny was poisoned by Russia with a lethal toxin derived from the skin of poison dart frogs.