LIMITED TEST BAN TREATY (LTBT)
Banned nuclear weapon tests in the atmosphere, in outer space and under water.
Signed by the US, UK and USSR in Moscow on 5 August 1963.
Entered into force on 10 October 1963.
NUCLEAR NON-PROLIFERATION TREATY (NPT)
Allows only the nuclear weapon states to have nuclear weapons and stops others from
aquiring them. For the purposes of the NPT, a nuclear weapon state is one which has
manufactured and exploded a nuclear weapon or other nuclear explosive device prior to 1
January 1967. So there are five nuclear weapon states: US, USSR (later Russia), Britain, France
and China. Signed in Washington, London, and Moscow on 1 July 1968.
Entered into force on 5 March 1970. Extended indefinitely in 1995.
STRATEGIC ARMS LIMITATION TALKS I (SALT-I)
The first round of the Strategic Arms Limitation Talks began in November 1969. The Soviet
leader Leonid Brezhnev and the US President Richard Nixon signed the following in Moscow
on 26 May 1972 – a) Treaty on the limitation of Anti-Ballistic Missile Systems (ABM Treaty); and
b) Interim Agreement on the limitation of strategic offensive arms.
Entered into force on 3 October 1972.
STRATEGIC ARMS LIMITATION TALKS II (SALT-II)
The second round started in November 1972. The US President Jimmy Carter and the Soviet
leader Leonid Brezhnev signed the Treaty on the limitation of strategic offensive arms in Vienna
on 18 June 1979.
STRATEGIC ARMS REDUCTION TREATY I (START-I)
Treaty signed by the USSR President Mikhail Gorbachev and the US President George Bush (Senior)
on the reduction and limitation of strategic offensive arms in Moscow on 31 July 1991.
STRATEGIC ARMS REDUCTION TREATY II (START-II)
Treaty signed by the Russian President Boris Yeltsin and the US President George Bush (Senior)
on the reduction and limitation of strategic offensive arms in Moscow on 3 January 1993.