Indonesia was admitted to UN membership on 28 September 1950 and is a member of ESCAP and all the nonregional specialized agencies. Following the seating of Malaysia in the Security Council, Indonesia withdrew from the UN on 7 January 1965; it resumed its seat on 28 September 1966. Indonesia is also a member of the Asian Development Bank, Colombo Plan, G-77, APEC, the WTO, International Tin Council, OPEC, and other intergovernmental organizations. Indonesia became one of the founding members of ASEAN in 1967. In March 1970, a treaty of friendship was signed between Indonesia and Malaysia; the treaty also established the boundary between the two countries in the Strait of Malacca. Indonesia is a signatory to GATT and the Law of the Sea.