The Agreement Concerning Cooperation in the Exploration and Use of Outer Space for Peaceful Purposes was an agreement between the United States (US) and the Union of Soviet Socialist Republics (USSR) which established a legal framework for the Apollo–Soyuz Test Project (ASTP) and refined the means and methods for sharing data between these two parties. It was written in the days leading up to May 24, 1972. Having been agreed upon months earlier, it was signed by US President Richard Nixon and USSR. Premier A. N. Kosygin in Moscow during a three-day state visit. This agreement was of particular significance as it furthered efforts towards cooperation in space between the US and the USSR. during the Cold War.