The Apollo–Soyuz Test Project (ASTP) (Russian: Экспериментальный полёт «Союз» — «Аполлон», Eksperimantalniy polyot Soyuz-Apollon, lit. "Experimental flight Soyuz-Apollo"), conducted in July 1975, was the first joint U.S.–Soviet space flight, and the last flight of an Apollo spacecraft.