Spotlight: Salisbury chemical attack sparks fierce discussions at UN Security Council

British Ambassador to the United Nations Karen Pierce(R) speaks with Russian Ambassador to the United Nations Vassily Nebenzia prior to a Security Council meeting on the poisoning of former Russian double agent Sergei Skripal and his daughter Yulia Skripal, at the UN headquarters in New York, April 5, 2018.(Xinhua/Li Muzi)