 Diem's complaints became more vocal as American soldiers, called "advisors", continued to pour into the country, and some began calling Diem an uncooperative client and a puppet pulling his own strings.After he became seen more as a liability than an asset to America, Diem was assassinated in 1963 with the complicity of the CIA and John F. Kennedy.During the Vietnam War, South Vietnam was allied with the United States and other anti-communist states in Asia and the West, whereas North Vietnam was allied with the Soviet Union, and with other socialist and communist nations.