Toxin found in poison dart frogs probably killed Alexei Navalny in a Russian prison, five countries announced on the two-year anniversary of his death.

LONDON (AP) — Russian opposition leader Alexei Navalny was poisoned by the Kremlin with a rare and lethal toxin found in the skin of poison dart frogs, five European countries said Saturday.

Five European countries say tests confirm late Russian opposition leader Alexei Navalny was poisoned with a lethal toxin found in poison frogs, and they blame the Kremlin.