2 years on, Navalny's death still casts a shadow over Russia and wider Europe

Mourners in Moscow have marked two years since Russian opposition leder Alexei Navalny died in an Arctic prison, as a new European analysis fuels claims he was killed by poisoning. On Monday, his family, supporters, and several European diplomats laid flowers at his grave under heavy security. His mother says Russian authorities killed him. The Kremlin says Navalny died of natural causes. On Saturday, the U.K., France, Germany, Sweden, and the Netherlands said lab tests found a rare toxin in samples from his body. Epibatidine is linked to poison dart frogs. Navalny’s allies remain in exile and struggle to unite.