Former Russian spy Alexander Litvinenko was murdered because of information he held on a powerful Kremlin figure, an ex-business associate has said. Ex-spy Yuri Shvets said Mr Litvinenko was commissioned by a reputable UK firm to provide information on Russia. Mr Litvinenko was poisoned after his dossier containing damaging details was deliberately leaked to the high-ranking Moscow figure, Mr Shvets told the BBC. Full Story