DESPERATE Russian claims that a US Lieutenant General has been captured in the Ukrainian city of Mariupol have been torn apart by a BBC expert.Journalist Alistair Coleman took to Twitter to destroy the claims, which he branded "fake news". He reposted one tweet, which said: "Unconfirmed. The rumours going around that a US Major General Roger L. Cloutier has been captured by Russian army at Azovstal in Mariupol. It would be within the Russians' right to execute this officer as nothing more than a common criminal. Not kidding. Legally by all laws."Mr Coleman retweeted another post, which claimed: "Unconfirmed sources...