How a retreat at a sleepy seaside resort in Thailand led to ASEAN’s formation

AUG 5, 2026 | 7-MIN READ

Today, ASEAN has 11 member states and is approaching its 60th anniversary in 2027.

From its original five members, the regional organisation has steadily expanded and is now set to become the world's fourth largest economy by 2030.

Although a stable regional alliance today, its origins were, in fact, fraught with uncertainty. It all started with one document from 1967 – the Bangkok declaration, which would later be known as the ASEAN declaration – that set the stage for regional cooperation.

August 1967

Five ministers gathered in Bang Saen, a coastal resort town located over an hour's drive from Bangkok.

They included Indonesia's Adam Malik, the Philippines' Narciso R. Ramos, Malaysia's Tun Abdul Razak, Singapore's S. Rajaratnam, and Thailand's Thanat Khoman. Only twenty-four hours earlier, they had convened at the Thai Ministry of Foreign Affairs for their first official meeting, to lay the groundwork for a new association for cooperation.

Southeast Asia in the 1960s was fractured by geopolitical rivalries and territorial conflicts, leaving relationships between neighbouring nations strained. As these tensions threatened to boil over, the leaders recognised that mutual cooperation and political stability were vital for the region's survival.

Yet, launching a unified initiative proved tricky.

The five founding ministers of ASEAN — Ministry of Information and the Arts Collection, courtesy of National Archives of Singapore.

After four days of informal discussions at a seaside resort, the ministers reached a breakthrough in their negotiations. The ultimate icebreaker? Playing golf.

As they walked the fairways, they debated, negotiated and refined the agreement's details in what would later be dubbed "sports shirt diplomacy".

Following the retreat, the leaders returned to Bangkok to sign the historic Bangkok Declaration, the founding document that established the Association of Southeast Asian Nations (ASEAN).

On August 8, 1967, ASEAN was born.

Cabinet Office Collection, courtesy of National Archives of Singapore.

We must now think at two levels. We must think not only of our national interests but posit them against regional interests: That is the new way of thinking about our problems.Share quote

From a statement by S. Rajaratnam, Minister for Foreign Affairs, in Bangkok, August 8, 1967.

As geopolitical tensions stabilised, it was time to look at closer economic cooperation.

1977: Foundations of an ASEAN trading bloc

ASEAN Agreement on Preferential Trading Arrangements

This agreement established the foundational framework for intra-ASEAN trade liberalisation, extending preferential tariff treatment on selected products among member states, including mechanisms such as long-term quantity contracts and liberalisation of non-tariff measures.

It laid the foundation for deeper regional economic integration, paving the way for the creation of a more comprehensive ASEAN trading bloc in the 1990s.

1992: Further eliminating tariff barriers

ASEAN Free Trade Area

In 1992, six ASEAN members – Brunei, Indonesia, Malaysia, the Philippines, Singapore and Thailand – signed the ASEAN Free Trade Area (AFTA) in Singapore. AFTA aimed to further eliminate tariff barriers among the Southeast Asian countries, integrating the ASEAN economies into a single production base and creating a regional market of 500 million people.

This led to increasing production efficiencies and long-term competitiveness, while providing ASEAN consumers a wider choice of better-quality consumer products.

2007: Towards greater economic integration

ASEAN Economic Community Blueprint 2008-2015

The first ASEAN Economic Community (AEC) Blueprint was adopted by ASEAN Leaders, serving as a master plan to guide the economic integration of ASEAN economies.

2009: Streamlining regional trade

ASEAN Trade in Goods Agreement signed

ASEAN Trade in Goods Agreement (ATIGA) aimed to provide a legal framework to enhance free flow of goods in the region by largely eliminating tariffs.

2012: Facilitating and protecting regional investments

ASEAN Comprehensive Investment Agreement

The regional investment treaty aimed to create a more liberal, facilitative, transparent, and competitive investment environment within ASEAN. Key features include liberalisation of investment rules, facilitation, protection and transparency measures to make it easier for investors to operate across ASEAN and attract foreign direct investment into ASEAN.

2015: ASEAN as a single market

ASEAN Economic Community 2008-2015 realised

The ASEAN Economic Community (AEC) Blueprint 2008-2015 was realised, advancing ASEAN further towards a single market and production base, and deepening regional economic integration through the seamless movement of goods, services, investment and capital in the region.

The next bound of ASEAN’s regional economic integration was launched through the AEC Blueprint 2016-2025.

2020: Integrating ASEAN’s service sectors

ASEAN Trade in Services Agreement signed

ASEAN Trade in Services Agreement (ATISA) aimed to deepen the integration of ASEAN’s services sectors, creating a more liberal, transparent and predictable environment for service suppliers in the region.

2020: Signing the world’s largest FTA

Regional Comprehensive Economic Partnership signed

The Regional Comprehensive Economic Partnership (RCEP) involves ASEAN member states alongside five major economies: Australia, China, Japan, Republic of Korea, and New Zealand. More than just a trade deal, the RCEP serves as a strategic signal of RCEP participating countries’ shared commitment to keeping markets open and integrated in the Asia Pacific.

It is the world’s largest Free Trade Agreement, accounting for around 30% of the global Gross Domestic Product (GDP) and a third of the world’s population.

2025: The next phase of economic integration

Upgraded ATIGA signed and ASEAN Economic Community Strategic Plan (2026 - 2030) launched

The upgraded ATIGA was signed in 2025, marking a major modernisation of the Agreement to strengthen regional supply chains, establish a crisis response framework, improve regulatory transparency, and advance digitalisation to enhance intra-regional trade flows.

ASEAN entered its next phase of regional economic integration with the realisation of AEC Blueprint 2025 and launch of the AEC Strategic Plan (2026-2030). The first five-year cycle of the AEC Strategic Plan features a forward-looking agenda, including for businesses to seize opportunities in emerging areas such as digital and green economies.

2026: The region’s first digital economy agreement

Conclusion and Signing of the ASEAN Digital Economy Framework Agreement

As the region’s first standalone and most comprehensive digital economy agreement, the ASEAN Digital Economy Framework Agreement (ASEAN DEFA) marks a new chapter in ASEAN’s digital economy journey. Once in force, it will help businesses better access opportunities in the region through its common rules and frameworks in key areas such as digital trade, e-commerce and e-payments. It will also support cooperation in emerging areas such as Artificial Intelligence.

The ASEAN DEFA is expected to be signed at the 49th ASEAN Summit in November 2026.

The ASEAN Declaration was signed in 1967 so Southeast Asian countries could foster closer political ties while pooling together collective resources for economic prosperity. By 2025, the region’s combined GDP was estimated to have crossed US$4 trillion.

This remarkable trajectory of economic progress signals great promise for the future: Southeast Asia is not just part of global markets; it is actively shaping them.