Five European countries have jointly accused Russia of assassinating opposition leader Alexei Navalny using a rare toxin derived from dart frogs. The UK, Sweden, France, Germany, and the Netherlands issued a statement confirming findings that Navalny was poisoned while in prison, leading to his death. The toxin, identified as epibatidine, is known for its neurotoxic effects. The allegations mark a significant escalation in tensions between Russia and the West, with European leaders emphasizing the implications of such acts against political dissenters. Russia has denied any involvement, rejecting the claims as unfounded.