Russia 'used frog toxin' to kill Alexei Navalny

European countries say tests show Russia's Alexei Navalny was poisoned with a substance developed from a toxin found in Ecuadorian dart frogs. But the Kremlin denies killing the opposition leader. Also: Marco Rubio delivers a softer line to America's European allies at the Munich Security Conference; there are more global protests against the Iranian government; families of Venezuelan political prisoners go on hunger strike; the "Trump slump" affects US tourism; Cuba's cigar festival is snuffed out; palaeontologists discover giant sloth and elephant-like mastodon fossils; and we visit the British inmates learning how to garden.

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