Anti-Ballistic Missile Treaty

An agreement signed in 1972 by the United States and the USSR as part of the SALT I Treaty. It limited each country's defensive ballistic missile system to two sites with 100 ABM launchers per site. In 1974 it was altered to limit each country to one ABM site and to allow only fixed, land-based ABM systems.

See the Introduction, Abbreviations and Pronunciation for further details.