In the war against the US of the Vietnamese people, the agreement and support of international public opinion, especially the public opinion of the Soviet Union, was one of the important factors contributing to the victory of the Vietnamese people. The article analyses and clarifies the support of the Soviets in the Vietnam War and condemns and denounces the crimes of American imperialism and its henchmen in the Vietnam War with the progressive people of the world. The article also points out that Soviet public opinion has also made the world understand the sinister nature of US imperialism in the Vietnam War, as well as the justification of the resistance war of the Vietnamese people in the great process of liberating the South and unifying the country.