Update – 11.45am:
Russian foreign minister Sergei Lavrov has accused the UK of trying to “grossly mislead” the world community over the Skripal case.
According to Russian news agency Tass, Mr Lavrov told a press conference that Britain was acting as if suspicion should be regarded as “the queen of evidence”.
Mr Lavrov said Moscow had not yet received an official request from the UK under the Convention on the Prohibition of Chemical Weapons, and would be prepared to respond within 10 days to an approach of this kind.
Downing Street has confirmed that Theresa May will make an oral statement to the House of Commons on the Skripal case following Prime Minister’s Questions.
European Council president Donald Tusk said he would put the poisoning on the agenda of next week’s European Council meeting. He tweeted: “I express my full solidarity with PM @theresa_may in the face of the brutal attack inspired, most likely, by Moscow. I’m ready to put the issue on next week’s #EUCO agenda.
“For real friends, this should be obvious: At a time of fake news spreading, meddling in our elections, and attacks on people on our soil with nerve agent, the response must not be transatlantic bickering but transatlantic unity.”