The Russian state has long been accused of using exotic poisons to murder its opponents, whether the nerve agent Novichok or radioactive plutonium isotopes.
Navalny was a political dissident who challenged Putin. He survived being poisoned with the Novichok nerve agent.
He died in prison after being poisoned with a deadly toxin found in Ecuadorian dart frogs, the UK and other allies have claimed.
Russian authorities insist Navalny’s death was natural.
Read more: https://news.sky.com/story/the-science-behind-the-frog-poison-that-allegedly-killed-alexei-navalny-13507513
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