Economic Dynamics in East Asia: Japan, China, and South Korea's Strategic Collaborations

Economic collaboration between China and Japan remains a vital component of their bilateral relations, even as global protectionism and Japan's rightward political shift pose challenges. This was highlighted during the launch of the "Blue Book of Japanese Economy: Annual Report on Japanese Economy and Sino-Japanese Economic and Trade Relations (2025)" in Beijing. Despite a significant decline in Japan's foreign direct investment in China—down nearly 60% from its 2017 peak—Japanese companies still recognize the Chinese market's importance. In 2024, Japan's direct investment in China was approximately 493.1 billion yen ($3.23 billion), ranking China as the ninth most favored destination for Japanese investment.

Trade cooperation continues to anchor Sino-Japanese tiesThe Straits TimesJapan IT Week Autumn 2025: NIPA Expands South Korea's Presence in Japan's AI and Deep Tech EcosystemJapanese PM Takaichi Vows to Bolster Ties with S. Korea through DialogueJapan TimesPresident Lee Jae-myung will attend the ASEAN summit in Malaysia on the 26th and take the global dip. .

Experts emphasize that while the decline in investment is notable, there are positive indicators of Japanese businesses' intentions to deepen ties with China. A survey by the Japanese Chamber of Commerce and Industry in China revealed that 56% of companies plan to maintain or increase their investments in China, with 54% considering it a top market. Furthermore, the return on direct investment for Japanese firms in China rose from 12.1% in 2015 to 18.4% in 2022, surpassing returns in the US and UK.

Trade cooperation continues to anchor Sino-Japanese tiesJapan IT Week Autumn 2025: NIPA Expands South Korea's Presence in Japan's AI and Deep Tech EcosystemJapan TimesThe Straits TimesThe Diplomat MagazinePresident Lee Jae-myung will attend the ASEAN summit in Malaysia on the 26th and take the global dip. .

Recent data from China's Commerce Ministry indicates a rebound in Japanese investment, which grew by 58.9% year-on-year in the first eight months of 2025. This resurgence is attributed to Japan's growing appreciation for China's modernization achievements, particularly in digital technology and poverty reduction. However, experts caution that Japan's political landscape may introduce uncertainties, particularly regarding economic security issues that could restrict investment in high-tech sectors.

Trade cooperation continues to anchor Sino-Japanese ties

Simultaneously, South Korea's National IT Industry Promotion Agency (NIPA) is actively expanding its presence in Japan's digital market. At the Japan IT Week Autumn 2025, NIPA led a delegation of 50 companies across various sectors, including AI and semiconductors, aiming to foster bilateral cooperation in digital innovation. The event is expected to attract around 31,000 visitors, showcasing Korea's technological capabilities and establishing partnerships within Japan's industrial ecosystem.

Japan IT Week Autumn 2025: NIPA Expands South Korea's Presence in Japan's AI and Deep Tech EcosystemTrade cooperation continues to anchor Sino-Japanese tiesJapan TimesPresident Lee Jae-myung will attend the ASEAN summit in Malaysia on the 26th and take the global dip. .Deputy Prime Minister Bae Kyunghoon Visits AI Safety Research Institute: "We Will Create an AI Environment the Public Can Trust"Japanese PM Takaichi Vows to Bolster Ties with S. Korea through Dialogue

In the broader context of East Asian diplomacy, South Korean President Lee Jae-myung is set to host significant summits, including meetings with US President Donald Trump and Chinese President Xi Jinping during the APEC summit in Gyeongju. These discussions will focus on trade, investment, and regional cooperation, with particular attention to tariff negotiations and economic security.

President Lee Jae-myung will attend the ASEAN summit in Malaysia on the 26th and take the global dip. .Seoul confirms summits with Trump and Xi, Japan's under discussionThe Straits TimesJapanese PM Takaichi Vows to Bolster Ties with S. Korea through DialogueThe Diplomat Magazine

Despite these collaborative efforts, there are concerns regarding the implications of Japan's political shift and the potential for increased economic security measures that could hinder investment flows. Analysts warn that Japan's aging shipbuilding facilities and the need for modernization may further complicate its competitive stance against Chinese and South Korean firms.

Trade cooperation continues to anchor Sino-Japanese ties

The evolving economic landscape in East Asia reflects a complex interplay of cooperation and competition among Japan, China, and South Korea. As these nations navigate their respective challenges, the emphasis on strategic partnerships and investments will be crucial for regional stability and growth. The upcoming diplomatic engagements, particularly during the APEC summit, will serve as a platform for addressing these critical issues and reinforcing economic ties.

President Lee Jae-myung will attend the ASEAN summit in Malaysia on the 26th and take the global dip. .