The report of the official inquiry into the death of former Russian spy Alexander Litvinenko is to be published on January 21.
The inquiry said its findings will be released in Parliament 48 hours after the report is delivered to Home Secretary Theresa May.
Mr Litvinenko, an outspoken critic of Vladimir Putin, died after drinking tea laced with radioactive polonium in a London hotel in 2006.
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The inquiry, chaired by Sir Robert Owen, heard claims that the Russian president personally ordered the killing.