What is behind the British PM’s threat to Russia?
British Prime Minister Theresa May has given Russia until Wednesday to explain why a nerve agent that it has developed was used in an attack in Salisbury, Wiltshire. She told the House of Commons that it was ‘highly likely’ that Russia was responsible for the poisoning of Sergei Skripal and his daughter. She said that Foreign Secretary Boris Johnson had summoned the Russian Ambassador and put it to him that were only two explanations for what had happened, one that the Russian government itself was responsible or that Moscow has lost control of its stock of deadly nerve agents. I think it is safe to assume that no explanation, at