 The United Nations took several steps to attempt to discipline these rebel actions, including restricting travel of UNITA senior officials, and prohibiting the sale of petroleum and related products from any country to Angola through United Nations Security Council Resolution 864.United States president Bill Clinton issued executive order 12865 to add U.S. sanctions in addition to the UN's efforts.In 1998 UNITA repealed another peace treaty and returned to war with the Angolan army, prompting the United Nations Security Council to investigate sanctions-busting operations and helping focus international attention on the link between diamonds and conflict in Africa.