Russia has always denied any involvement in the death of a former spy, but the European Court of Human Rights says it was "beyond doubt" that Moscow assassinated Alexander Litvinenko.

The shocking image of a violently ill Alexander Litvinenko as he lay dying from radioactive poisoning in a London hospital bed is how much of the world remembers the ex Russian spy. But a new opera in London based on a book by his wife Marina and composed by former London financier, Anthony Bolton seeks to tell more of his story. A British public inquiry in 2016 concluded that Russian President Vladimir Putin had "probably approved" Litvinenko's killing, which it said was likely to have been FSB-directed, but no one has ever been brought to justice.