Which mission proved that the united states and russia were ready to conduct mutual experiments

The Mission was the Apollo-Soyuz Test Project

The Apollo-Soyuz Test Project was the first spaceflight that included two nations working together with their own national spacecraft. The Americans sent up an Apollo command module, while the Russians launched a Soyuz spacecraft.

"The Soyuz and Apollo spacecraft docked on July 17, 1975, in a demonstration of how well the rendezvous and docking systems of each spacecraft would work with each other. The combined crew of five people — three Americans, two Soviets — spent about two days in orbit working on experiments and conducting joint press conferences."

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