Theresa May stated in the British Parliament the 12. March that Russia has previously killed Russian ex-agents and defectors, and that therefore "in all likelihood" also Russia has attacked Skripal. British Foreign Minister Boris Johnson clarified and referred to Litvinenko – the former Russian intelligence agent who was killed in 2006 by the poison polonium 210 in England.
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Christopher Steele of MI6 investigated the Litvinenko case. He headed MI6's Russia office from 2006 to 2009. Steele is more famous today for the report he wrote in 2016 on Donald Trump's sex life in Moscow – funded by Hilary Clinton's presidential campaign.
When Steele ended the investigation into Litvinenko's poisoning, he claimed that Litvinenko was poisoned by his Russian contacts Andrei Lugovoy. . .