China Intensifies Economic Sanctions on Taiwan — The Structural Dynamics

📡 THE SIGNAL — What Happened

Why it matters: As China escalates economic pressure on Taiwan to unprecedented levels, Japan is being forced to make one of its biggest post-war diplomatic choices: "Taiwan support" at the forefront of US-China rivalry. This move has the potential to rewrite the security order of East Asia itself.

• Sanctions — From late 2025, China gradually expanded import restrictions on Taiwanese agricultural products and electronic components, and in early 2026, introduced new regulatory measures targeting the business activities of Taiwanese companies in mainland China.
• Economy — Taiwan's export dependence on China has decreased from approximately 43% in 2020 to about 35% in 2025, but China remains its largest trading partner.
• Diplomacy — Japan and Taiwan intensified informal consultations on semiconductor supply chains in late 2025, and the operation of TSMC's second factory in Japan (Kumamoto) was brought forward to the end of 2025.
• Security — Japan's 2026 defense budget reached approximately 1.5% of GDP, with a focus on strengthening defense capabilities in the Nansei Islands.
• Military — The Chinese People's Liberation Army conducted a record number of military exercises around Taiwan in 2025, and the activity of aircraft and vessels crossing the median line of the Taiwan Strait has become normalized.
• Technology — Taiwan announced a joint research program with Japan in advanced semiconductor and quantum technology fields in January 2026, and a trilateral cooperation framework linked to the US CHIPS Act is taking shape.
• Domestic Politics — In Japan, debate over responses to a Taiwan contingency has intensified between ruling and opposition parties, with security policy becoming a major issue ahead of the 2026 House of Councillors election.
• Alliance — In the Japan-US summit meeting in February 2026, "peace and stability in the Taiwan Strait" was explicitly stated in the joint statement, adopting stronger language than before.
• Economic Sanctions — China is also increasing indirect pressure on third-country companies that have economic ties with Taiwan, forcing some Japanese companies to re-evaluate business risks in the Chinese market.
• International Organizations — The issue of Taiwan's participation in international organizations such as the WHO and CPTPP has resurfaced, with Japan increasingly clarifying its supportive stance.
• Public Opinion — Public opinion polls in Japan show that support for "some form of assistance" to Taiwan rose from 52% in 2024 to 61% in early 2026.
• Energy — Japan's energy security risks in a Taiwan Strait contingency scenario are being re-evaluated, with the expansion of LNG reserves and securing alternative shipping routes becoming policy priorities.

To understand Japan's position on the Taiwan issue, one must go back to the formation process of the post-war East Asian order. In the process from the 1952 Japan-ROC Peace Treaty to the 1972 normalization of diplomatic relations with China, Japan severed formal diplomatic ties with Taiwan, but economic and cultural exchanges at the private level were maintained through "unofficial channels." This ambiguous relationship is both a structural characteristic and a constraint of today's Japan-Taiwan relations.

During the Cold War, the Taiwan Strait was one of the front lines of US-Soviet confrontation. In the 1954 and 1958 Taiwan Strait Crises, the US demonstrated its willingness to intervene militarily, deterring China's armed unification. However, with the normalization of US-China diplomatic relations and the enactment of the Taiwan Relations Act in 1979, US policy toward Taiwan shifted to "strategic ambiguity." This ambiguity supported stability in the Taiwan Strait for about half a century, but as China's military and economic power rapidly expanded under the Xi Jinping administration, its effectiveness has been questioned.

Since the 2010s, China has gradually intensified pressure on Taiwan, primarily through economic means. After the inauguration of the Tsai Ing-wen administration in 2016, China implemented restrictions on group tours to Taiwan, suspended imports of agricultural products, and obstructed Taiwan's participation in international organizations. After then-US House Speaker Pelosi's visit to Taiwan in 2022, large-scale military exercises were conducted, establishing a "new normal" in the Taiwan Strait. These moves are typical examples of "gray zone" tactics that do not involve the use of force, and they have the effect of gradually lowering the threshold for military escalation.

For Japan, the turning point where the Taiwan issue rapidly became a "matter of its own" was the Japan-US summit meeting in 2021. The joint statement explicitly mentioned the "importance of peace and stability in the Taiwan Strait" for the first time in 52 years since the 1969 Sato-Nixon talks. This was a historic turning point in Japan's security policy. Since then, Japan has accelerated the construction of a defense posture anticipating a Taiwan contingency, including increasing defense spending, acquiring counterattack capabilities, and strengthening military power in the Nansei Islands.

Economically, the intensification of US-China technological competition is the biggest driving force behind the Japan-Taiwan rapprochement. The reality that Taiwan's TSMC accounts for approximately 90% of the world's advanced semiconductor manufacturing has dramatically increased Taiwan's geopolitical value. The Japanese government's decision to invest subsidies of up to 1.2 trillion yen in the construction of TSMC's Kumamoto factory was not merely an industrial policy but a semiconductor strategy as a security policy. This is a symbolic example of the concept of "economic security" being incorporated into Japan's policy framework.

From 2024 to 2025, as China's economic slowdown and real estate crisis deepen, the Xi Jinping administration is strengthening its motivation to direct domestic dissatisfaction outwards. The intensification of economic sanctions against Taiwan has the dual purpose of inciting nationalism domestically and isolating Taiwan internationally. At the same time, China has repeatedly warned Japan against "intervention in the Taiwan issue," and Japan-China relations have entered a state of structural tension.

What makes the current situation historically unique is the simultaneous deepening of economic interdependence and security confrontation. Japanese companies' outstanding investments in China remain enormous, and a complete withdrawal from the Chinese market is not realistic. However, as the risk of a Taiwan contingency increases, Japanese companies will be forced to accelerate the "de-Sinicization" of their supply chains. This conflict between economy and security is the biggest structural factor defining Japan's Taiwan policy. The year 2026 is becoming a turning point where Japan will be required to provide concrete policy answers to this structural dilemma.

The delta: China's economic sanctions against Taiwan are shifting from a "gray zone" to a stage of "explicit economic warfare," which is forcing Japan to make a choice for the first time in the post-war era: whether or not to implement "Taiwan support" as a concrete policy. The rapid narrowing of room for the traditional "ambiguity strategy" to function is the core of this structural change.