The widow of a Russian spy poisoned in London has said the "whole world" will know the truth about what happened to her husband as a public inquiry into his death formally opened.
Marina Litvinenko said outside the Royal Courts of Justice she was positive the inquiry into her husband Alexander's death would get under way in January next year.
Sir Robert Owen, chair of the inquiry, praised the widow in the hearing for her patience in the face of "highly regrettable" delays.
Ms Litvinenko said today was a "special" day and she was confident the inquiry will start on schedule.
"Everybody all around the world will know the truth," she added.
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