half a decade later. The enrichment programs also likely ended around this time. Dismantling South African forces feared the threat of a "domino effect" in favour of communism, represented in southern Africa by Cuban forces in Angola, aiding Angolan Marxist-Leninist revolutionary groups against rivals supported by South African forces, and threatening Namibia. In 1988, South Africa signed the Tripartite Accord with Cuba and Angola, which led to the withdrawal of South African and Cuban troops from Angola and independence for Namibia. The pre-emptive elimination of nuclear weapons was expected to make a significant contribution toward regional stability and peace, and also to help restore South Africa's credibility in regional and international politics. F.W. de Klerk saw the presence of nuclear weapons in South Africa as a problem. F. W. de Klerk disclosed the information about his weapons to the United States in an effort to get the weapons removed. South Africa ended its nuclear weapons programme in 1989. All the bombs (six constructed and one under construction) were dismantled and South Africa acceded to the Treaty on the Non-Proliferation of Nuclear Weapons when South African Ambassador to the United States Harry Schwarz acceded to the treaty in 1991. On 19 August 1994, after completing its inspection, the International Atomic Energy Agency (IAEA) confirmed that one partially completed and six fully completed nuclear weapons had been dismantled. As a result, the IAEA was satisfied that South Africa's nuclear programme had been converted to peaceful applications. Following this, South Africa joined the Nuclear Suppliers Group (NSG) as a full member on 5 April 1995. South Africa played a leading role in the establishment of the African Nuclear-Weapon-Free Zone Treaty (also referred to as the Treaty of Pelindaba) in 1996, becoming one of the first members in 1997. South Africa also signed the Comprehensive Nuclear-Test-Ban Treaty in 1996 and ratified it in 1999. In 1993, Bill Keller of The New York Times reported that popular suspicion in Southern African nations held that the timing of disarmament indicated a desire to prevent a nuclear arsenal from falling into the hands of a native African and Coloured government with the collapse of the Apartheid system controlled by European settlers. De Klerk denied such a motivation when asked about this in a 2017 interview. The African National Congress political party, which took power in South Africa after Apartheid, approved of nuclear disarmament. The Treaty of Pelindaba