A joint British and American spying operation at the United Nations scuppered a last-ditch initiative to avert the invasion of Iraq, The Observer can reveal. Senior UN diplomats from Mexico and Chile provided new evidence last week that their missions were spied on, in direct contravention of international law. The former Mexican ambassador to the UN, Adolfo Aguilar Zinser, told The Observer that US officials intervened last March, just days before the war against Saddam was launched, to halt secret negotiations for a compromise resolution to give weapons inspectors more time to complete their work. Aguilar Zinser claimed that the...