Organisation for the Prohibition of Chemical Weapons ("OPCW"). Sergey Skripal

Russia has now publicly responded to the British government’s ultimatum – set out in Theresa May’s statement yesterday – that unless Russia provides a ‘credible response’ to the British enquiry about Russia’s custody of Novichok chemicals by close of business today, then the British government will treat the attack on Skripal as the action of the Russian state.