It was just a chess game between the U.S. and Russia.
Our hearts were never in it as citizens of the U.S. In fact many people were protesting the government's role. It's hard to win any war when the citizens are not in support of it in a free democracy.
Subsequent to President Clinton's normalization announcement, in August 1995, both countries upgraded their Liaison Offices opened during January 1995 to embassy status. As diplomatic ties between the nations grew, the United States opened a consulate general in Ho Chi Minh City, and Vietnam opened a consulate in San Francisco, California.
U.S. relations with Vietnam have become deeper and more diverse in the years since political normalization. The two countries have broadened their political exchanges through regular and regional security.
Ironically the U.S. never stopped importing products from Russia. (Vodka, frozen crab, cod fish, caviar, tires, and other things.)
If someone was really your "enemy" would you drink or eat anything they sent you? Russia also imports products from the U.S. At the time of the Vietnam war the goal of the U.S. was to stop the spread of communism around the globe. Strategic wars seldom win over the hearts and minds of everyday citizens whose sons and daughters are asked to lay their lives on the line.