In response to the coup against President Ngô Đình Diệm in South Vietnam, Prince Sihanouk cancelled on 20 November 1963 all American aid, and on 15 January 1964 the US MAAG aid program was suspended when Cambodia adopted a neutrality policy. The ARK continued to rely on French military assistance but at the same time turned to the Soviet Union, China, Czechoslovakia, Britain, Belgium, and West Germany for weapons, equipment and training.