1973 in the Vietnam War for the U.S. Christmas bombing (Operation Linebacker II) and that "we deplore the action." President Nixon wrote a letter to President Nguyen Thieu of South Vietnam asking for Thieu's cooperation in the Paris peace negotiations and stating that "the unity of our two countries...would be gravely jeopardized if you persist in your present course." Thieu had scuttled a draft peace agreement reached in October 1972. Nixon pledged to respond with "full force" if North Vietnam violated the peace agreement. As U.S. National Security Adviser Henry Kissinger prepared to resume peace talks with North Vietnam in Paris, United States President Nixon
1955 in the Vietnam War former colonial ties to France. The United States closed its embassy in Hanoi, thus ending formal diplomatic relations with North Vietnam. The U.S. would not restore diplomatic relations until 1998. China informed North Vietnam that all members of the China Military Advisory Group, which had been in Vietnam since July 1950, would return to China. This action by China illustrated the Chinese view that the most important task of North Vietnam was to consolidate its rule rather than attempt to force reunification with South Vietnam. 1955 in the Vietnam War In 1955, the Prime Minister of South Vietnam Ngô Đình