Zwei-plus-Vier-Vertrag
Walters was then United States Ambassador to the United Nations from 1985 to 1989 and ambassador to the Federal Republic of Germany from 1989 to 1991, being responsible on behalf of the United States for the preparations of the Treaty on the Final Settlement with Respect to Germany. In 1986, he received the Golden Plate Award of the American Academy of Achievement. In 1987 he visited Fiji, two weeks after Timoci Bavadra came to office. Bavadra wanted to create a nuclear-free zone in Fiji. William Bodde Jr. had said previously about this: "a nuclear free zone would be unacceptable to the US given our strategic needs (...) the US must do everything possible to counter this movement". Walters spoke with Bavadra and Sitiveni Rabuka. Two weeks later Bavadra was overthrown by Rabuka.