To supply their favored nationalist movements with weapons, the Soviet Union and United States together had spent more than $1 billion. With the MPLA now in control of the government, UNITA continued to fight guerilla warfare in the Angolan bush, although with only limited support from the US and South Africa where new administrations partially withdrew from the conflict.  By 1983 his army had reached the large diamond fields of northeastern Angola.  Diamonds would become a major source of revenue for UNITA, bringing in enough money to make the organization less dependent on foreign support.