In November 1963, a conspiracy at the highest levels of the United States government orchestrated a coup détat that culminated in the assassination of the President. The victim of this conspiracy wasnt President John F. Kennedy. It was President Ngô Đình Diệm of South Vietnam, assassinated in Saigon on 2 November 1963. For six decades, Kennedys role in the overthrow and assassination of his fellow president has been obscured by detractors and defenders alike. That role is now clearer, thanks to the declassification of extraordinary evidence.
JFK created the best evidence himself. He secretly tape-recorded 23 White House meetings weighing the pros and cons of regime change in Saigon. In the second year of his presidency, Kennedy had a Secret Service agent conceal microphones in the Oval Office and the Cabinet Room and hook them up to a Tandberg reel-to-reel tape machine hidden behind locked doors in the White House basement. The President could activate the tape recorder at the press of a button that looked like a buzzer. One button was under the surface of the Resolute Desk, another on the coffee table by his rocking chair in the Oval Office, and a third on the Cabinet Room table in front of his chair. The microphones were hidden under the desktop, on the coffee table in what looked like a buzzer box, and in a pair of light fixtures behind the curtains over the Cabinet Room windows. Kennedy held the secret of his taping system close, limiting knowledge of its existence to the Secret Service agents who changed out the tapes; his personal secretary, Evelyn M. Lincoln, who wrote the date and the time on each tape box; and his brother, Robert F. Kennedy, who was the Presidents closest adviser and the Attorney General of the United States.1
A second source of extraordinary evidence was the JFK Assassination Records Review Board (ARRB). The President John F. Kennedy Records Collection Act of 1992 empowered an independent board of impartial private citizens to declassify U.S. government documents related to the JFK assassination.2 The JFK ARRB used that power to open files that would ordinarily stay closed to the public. In its final report, the board said it cast a broad net to release valuable documents from the early 1960s that enhance the historical understanding of that era, and the political and diplomatic context in which the assassination occurred.3 That context included the overthrow and assassination of Diệm. The JFK ARRB declassified the records of a congressional investigation of the coup by the Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities, better known as the Church Committee, after Chairman Frank F. Church [DIdaho]. The evidence and testimony collected by the Church Committee paint a fuller picture of President Kennedys role in the coup and assassinations than the committees 1975 interim report, Alleged Assassination Plots Involving Foreign Leaders.4
https://prde.upress.virginia.edu/content/JFK_Vietnam2
FWIW
Upon learning of Diệm's ouster and assassination, Hồ Chí Minh reportedly stated: "I can scarcely believe the Americans would be so stupid".[6] The North Vietnamese Politburo was more explicit:
The consequences of the 1 November coup d'état will be contrary to the calculations of the US imperialists ... Diệm was one of the strongest individuals resisting the people and Communism. Everything that could be done in an attempt to crush the revolution was carried out by Diệm. Diệm was one of the most competent lackeys of the US imperialists ... Among the anti-Communists in South Vietnam or exiled in other countries, no one has sufficient political assets and abilities to cause others to obey. Therefore, the lackey administration cannot be stabilized. The coup d'état on 1 November 1963 will not be the last.[6]
After Diệm's assassination, South Vietnam was unable to establish a stable government and several coups took place. While the United States continued to influence South Vietnam's government, the assassination bolstered North Vietnamese attempts to characterize the South Vietnamese as "supporters of colonialism".[179]https://en.wikipedia.org/wiki/Ngo_Dinh_Diem