A man looks at a portrait of ex-spy Andrei Litvinenko by Russian artists Dmitry Vrubel and Viktoria Timofeyeva in the Marat Guelman gallery in Moscow May 22, 2007. Moscow cannot extradite former KGB agent Andrei Lugovoy to Britain on charges of murdering fellow ex-spy Alexander Litvinenko because of a constitutional ban, the Russian Prosecutor-General's office said on Tuesday. REUTERS/Sergei Karpukhin (RUSSIA) - RTR1PYPQ
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