| Contracting Parties/Signatories | Signature | Instrument | In Force | Details |
|---|---|---|---|---|
| Bangladesh | July 31, 1975 | June 17, 1976 | ||
| China | Accession : April 12, 2001 | January 1, 2002 | ||
| India | July 31, 1975 | June 17, 1976 | ||
| Lao People's Democratic Republic | July 31, 1975 | June 17, 1976 | ||
| Republic of Korea | July 31, 1975 | June 17, 1976 | ||
| Sri Lanka | July 31, 1975 | June 17, 1976 |