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."

The Apollo-Soyuz Mission was a joint effort between the United States and The Soviet Union which occurred in 1975. The mission consisted of launching an American Apollo Module into space and docking it into the Soviet Soyuz 19.

This was one of the many efforts in order to ease relations between the two governments during the Cold War. it marked the end of the Space Race, which started with the launch of the Sputnik spacecraft in 1957.