Status of the implementation of the major multilateral arms control agreements, as of 1 October 1981

Key to abbreviations used in the table:

S: signature

R: deposit of instrument of ratification, accession or succession

Place of signature and/or deposit of the instrument of ratification, accession or succession:

L: London

M: Moscow

W: Washington

Under the Antarctic Treaty, the only depositary is the US government; under the Treaty of Tlatelolco, the Mexican government; and under the ENMOD Convention, the UN Secretary-General.