Moscow wants to test the rare nerve agent used to poison a former Russian spy and his daughter in the UK.Russian Foreign Minister Sergei Lavrov claims Britain has denied Moscow's request to access to materials related to the case.He denied allegations that the nerve agent came from Russia and said President Vladimir Putin's government has no connection to the poisoning.Prime Minister Theresa May has said it was "highly likely" that Russia was responsible for the March 4 attack on Sergei Skripal, 66, and his daughter Yulia, 33, in Salisbury, Wiltshire.Putin's government faces a midnight deadline to explain how a nerve agent developed by the Soviet Union was used to poison the Skripals in a UK city.The Prime Minister said the pair were poisoned by a substance that was part of the Novichok group of nerve agents which were developed by the Soviet military during the 1970s and 1980s.Mr Skripal, a former spy who betrayed Moscow, and his daughter have been in a critical condition since they were found slumped on a bench in Salisbury city centre more than a week ago.We'll be bringing you the very latest updates, pictures and video on this breaking news story.For the latest news and breaking news visit Mirror.co.uk/news .Get all the big headlines, pictures, analysis, opinion and video on the stories that matter to you.Follow us on Twitter @DailyMirror - the official Daily Mirror & Mirror Online Twitter account - real news in real time.We're also on Facebook/dailymirror - your must-see news, features, videos and pictures throughout the day from the Daily Mirror, Sunday Mirror and Mirror Online.
