Apollo-Soyuz 50th Anniversary: A Handshake in Orbit That Transformed the Space RaceThe Apollo-Soyuz Test Project brought Soviet cosmonauts and NASA astronauts together in the first international human spaceflight.
Source: Apollo-Soyuz 50th Anniversary: A Handshake in Orbit That Transformed the Space Race (https://www.nytimes.com/2025/07/14/science/apollo-soyuz-test-project-1975-anniversary.html)