Soviet Union – 1817 to 1991
The Apollo-Soyuz Test Project was the first international human spaceflight mission, conducted in July 1975, which marked a significant collaboration between the United States and the Soviet Union during the era of détente. This mission demonstrated the ability of two different space systems to dock in orbit, showcasing not only technological cooperation but also a thawing of Cold War tensions through shared scientific objectives and peaceful exploration of space.
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