Peng participated in a number of foreign trips throughout the communist world after he had become Defense Minister, the first time that he had traveled outside of China and North Korea. In May 1955 Peng visited East Germany, Poland, and the Soviet Union and met with Wilhelm Pieck, Józef Cyrankiewicz, Nikita Khrushchev and Soviet Marshals Konstantin Rokossovsky and Georgy Zhukov. In September 1955, Peng traveled to Poland and the Soviet Union to attend the signing of the Warsaw Pact as an observer. From November 2 to December 3, 1957, Peng accompanied Mao on his second visit to the Soviet Union. From April 24 to June 13, 1959 Peng went on a "military goodwill tour" across the communist world and visited Poland, East Germany, Czechoslovakia, Hungary, Romania, Bulgaria, Albania, the Soviet Union, and Mongolia.