sentences:  U.S. aid to UNITA began to flow overtly after Congress repealed the Clark Amendment, a long-standing legislative prohibition on military aid to UNITA.Following these victories, Johns and the Heritage Foundation urged further expanding the Reagan Doctrine to Ethiopia, where they argued that the Ethiopian famine was a product of the military and agricultural policies of Ethiopia's Soviet-supported Mengistu Haile Mariam government.Johns and Heritage also argued that Mengistu's decision to permit a Soviet naval and air presence on the Red Sea ports of Eritrea represented a strategic challenge to U.S. security interests in the Middle East and North Africa.