What agreements were concluded between the USSR and the USA in the 70s?

In the 70s of the 20th century, agreements on arms reduction were concluded between the USSR and the United States. This was facilitated by the understanding that constantly arming yourself, creating new weapons that you plan to use, you can destroy everything around. Another reason for this was the fact that space began to be explored, intelligence improved, which made it possible to track the tests and movements of nuclear weapons in the territories of countries.