U.S. Ambassador to the United Nations Nikki Haley speaks during a Security Council meeting on the situation between Britain and Russia, Wednesday, March 14, 2018 at United Nations headquarters. Britain said Wednesday it would expel 23 Russian diplomats and sever high-level bilateral contacts after Russia ignored a deadline to explain how a Soviet-developed nerve agent was used against ex-spy Sergei Skripal and his daughter Yulia. (AP Photo/Mary Altaffer)