Economic cooperation between Southeast Asia and the region’s three major Northeast Asian partners is gaining momentum, with new figures showing a sharp increase in trade and continued investment flows.

The ASEAN-Plus Three framework, bringing together the ten ASEAN member states with China, Japan and South Korea, is increasingly becoming an important platform for strengthening regional economic resilience, digital connectivity, investment and sustainable development.

Recent preliminary figures show that two-way trade between ASEAN and the three Northeast Asian economies climbed to $1.4 trillion in 2025, representing a 13.7 percent increase from the previous year’s $1.2 trillion.

Investment Also Remains Strong

Trade growth has been accompanied by significant investment activity.

Foreign direct investment from China, Japan and South Korea into ASEAN reached $44.8 billion in 2025, accounting for approximately 18.2 percent of total foreign direct investment entering ASEAN.

The figures highlight the importance of the three Northeast Asian economies to Southeast Asia’s manufacturing, technology, infrastructure and wider economic development.

Regional Resilience Becomes a Major Priority

ASEAN and its Plus Three partners are placing greater emphasis on building economies capable of dealing with external shocks.

Global supply-chain disruptions, geopolitical tensions, changing trade policies and uncertainty in international markets have increased the importance of regional economic cooperation.

The countries are therefore working to improve connectivity, strengthen trade links and support businesses that operate across borders.

The latest economic cooperation programme for 2027–2028 places particular emphasis on regional resilience and cooperation in areas including digital connectivity, sustainable development, innovation, entrepreneurship and support for micro, small and medium-sized enterprises.

Digital Economy Moves Higher on the Agenda

Digital transformation is emerging as one of the most important areas of ASEAN-Plus Three cooperation.

The participating economies are exploring ways to improve digital connectivity and create opportunities for businesses to participate more effectively in regional markets.

Digital services, online commerce, technology-driven manufacturing and digital financial systems are becoming increasingly important components of Asian economic growth.

Closer cooperation could also help smaller businesses gain access to regional markets and technology.

Support for Small Businesses

Micro, small and medium-sized enterprises remain a major focus of the regional economic agenda.

Smaller companies often face greater difficulties when entering foreign markets because of regulatory requirements, financing limitations and technology gaps.

Regional cooperation programmes are therefore seeking to create conditions that allow these businesses to participate more actively in international trade.

Greater digital connectivity could further reduce some of the traditional barriers faced by smaller enterprises.

Sustainable Development Becomes Central

Economic expansion is increasingly being linked with sustainability.

ASEAN and its Plus Three partners are discussing ways to combine economic growth with environmental objectives, technological innovation and more resilient production systems.

This could create additional opportunities in clean technologies, sustainable infrastructure and resource-efficient manufacturing.

Stronger Links Between Major Asian Economies

The growing trade relationship also demonstrates the increasingly interconnected nature of Asian economies.

ASEAN has become deeply integrated into regional manufacturing and supply networks, while China, Japan and South Korea remain major sources of technology, investment, industrial demand and trade.

The relationship extends beyond merchandise trade into services, investment, digital technologies and other emerging economic sectors.

Preparing for the Next Phase

The latest consultation also endorsed a new ASEAN-Plus Three Economic Cooperation Work Programme covering 2027–2028.

The programme is intended to provide a framework for continued cooperation and strengthen economic ties between Southeast Asia and the three Northeast Asian partners.

The next phase is expected to focus increasingly on innovation, entrepreneurship, digital transformation and sustainable growth rather than traditional trade alone.

Why the Numbers Matter

The rise to $1.4 trillion in two-way trade demonstrates the scale of economic activity connecting ASEAN with China, Japan and South Korea.

For businesses, stronger regional integration can create new opportunities to access consumers, suppliers, investors and technology across multiple Asian markets.

For governments, closer economic links can provide additional mechanisms for responding collectively to changes in the global economy.

Outlook for Asian Economic Cooperation

ASEAN-Plus Three economic relations are entering a period in which resilience, technology and sustainability are becoming as important as conventional trade.

With trade expanding and investment continuing to flow into Southeast Asia, policymakers are seeking to build a regional economic environment capable of supporting long-term growth while responding to global uncertainty.

The direction of future cooperation will likely depend on how effectively participating economies can turn their ambitious regional programmes into practical opportunities for businesses, workers and consumers.