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 #skynews #russia #ukraine #worldnews #alexeinavalny SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Sky News Daily podcast is available for free here: https://podfollow.com/skynewsdaily/ To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales