Russia denies poisoned spy claimsThe Kremlin has dismissed as "sheer nonsense" claims it was involved in the poisoning by thallium of a former KGB colonel living in the UK.
Alexander Litvinenko, 41, has been moved to intensive care at UCH hospital after a deterioration in his condition.
The critic of Russian President Vladimir Putin fell ill on 1 November after a meeting at a London sushi bar.
His condition remains serious but stable. Met Police anti-terrorist officers are leading the investigation.
Friends of Mr Litvinenko have alleged he was poisoned because he was critical of the Russian government.
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