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13 December 2012, 18:53 | Updated: 13 December 2012, 18:57
It has emerged the Russian state was involved in the murder of former spy Alexander Litvinenko in central London.
A legal review in Camden, ahead of an inquest, has also heard Russia refused to extradite a main suspect over his death to the UK for questioning.
The 43 year old, who had been employed by MI6 for a number of years, died in 2006 after consuming radioactive polonium at a restaurant in Grosvenor Square.
The inquest next year will be held before High Court judge Sir Robert Owen, who has been appointed assistant deputy coroner.