Sergei Skripal sold secrets to Britain and later moved there in a 2010 spy swap with Russia
London: Russia's embassy to London called Tuesday for a joint investigation into a nerve agent attack on a former Russian spy living in Britain and warned the British government against taking any punitive measures.
"Today the Embassy sent a note to @ForeignOffice reiterating that Russia is not involved in the Salisbury incident and outlining… demands for joint investigation," the embassy said on Twitter.
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Source: NDTV News