After the outbreak of the Six-Day War in June 1967, Sudan declared war on Israel and broke diplomatic relations with the U.S. Relations improved after July 1971, when the Sudanese Communist Party attempted to overthrow President Nimeiry, and Nimeiry suspected Soviet involvement. Relations improved further after the U.S. provided assistance for the resettlement of refugees following the 1972 peace settlement that brought the First Sudanese Civil War with the south.