Via the Prof:
Both the Johnson and Nixon Administrations warned that a US failure to win the war in Vietnam and to withdraw without achieving its objectives would have dire consequences. Our allies would be dismayed and our enemies emboldened. Widespread instability would be certain to follow. In the event, negotiations were undertaken to cover the withdrawal. It was the product of a complex diplomacy, including the establishment of a dialogue with Communist China, and negotiations with North Vietnam--both countries the US vowed it would never talk to.