Abe warns Taiwan crisis threatens Japan, vowing direct US-Japan intervention

In a recent diplomatic speech, former Japanese Prime Minister Shinzo Abe explicitly asserted that "a contingency for Taiwan is a contingency for Japan, and also a contingency for the Japan-U.S. alliance." This statement has drawn widespread attention within Japanese political circles and the international security community. During his tenure from 2012 to 2020, Abe repeatedly utilized the core values of "freedom and democracy" to promote an upgraded role for Japan in the Indo-Pacific strategy while actively strengthening defense cooperation with the United States. His remarks not only directly echo the situation across the Taiwan Strait, but also signal a shift in Japan's China policy from "wait-and-see" to a stance of "explicit intervention." Scholar Lai I-chung pointed out that Abe's formulation shatters the ambiguity of Japan's past Taiwan policy, officially incorporating the Taiwan issue into Japan's national security considerations and linking it with the defense framework of the Japan-U.S. alliance.

However, Lai also cautioned that Taiwan-Japan relations currently still present a contradictory dynamic of "warm among the people, cold among officials." At the civilian level, public favorability in Taiwan toward Japan has remained consistently high for a long time, with tourism, cultural exchanges, and economic ties continuing to grow. Japanese citizens also hold positive views regarding Taiwan's democracy and freedom, and frequent people-to-people interactions between the two sides have formed a quite vibrant social foundation. In contrast, official interactions remain low-profile due to historical factors and diplomatic constraints. Japan's Taiwan policy continues to be restricted by the delicate balance between the Sino-Japanese Peace and Friendship Treaty and the Treaty of Mutual Cooperation and Security Between the United States and Japan, while domestic politics also requires consideration of conservative factions' sensitivity toward Beijing. Consequently, the government exercises restraint in public statements and concrete actions.

Against this backdrop, Lai proposed three major directions for the future development of Taiwan-Japan relations. The first is the establishment of a high-level strategic communication mechanism, enabling both sides to rapidly share intelligence and coordinate responses during a crisis through regularized security dialogues and policy coordination. The second is the enhancement of military coordination, including joint exercises, weapon system interoperability, and maritime security cooperation. This will not only help boost Taiwan's defense capabilities but also allow Japan to secure more substantive operational support within the Indo-Pacific strategy. The third is the construction of a third-country cooperation platform. By jointly promoting a multilateral security architecture with countries that similarly focus on Indo-Pacific stability—such as the United States, Australia, and India—bilateral goodwill can be transformed into institutionalized partnerships, forming a joint defense line against unilateral pressure.

Viewed from the perspective of regional security, if Taiwan and Japan successfully institutionalize their public enthusiasm, it will create a more direct check on China's maritime expansion and political oppression. If Japan allocates support items for Taiwan within its defense budget, it will imbue the "first island chain" concept of the Japan-U.S. alliance with more substantive meaning. At the same time, Taiwan will also secure more persuasive security endorsements on the international stage, elevating its diplomatic space. Conversely, China may cite "Japanese interference in internal affairs" or "disruption of regional peace" as reasons to step up military drills and diplomatic pressure against Taiwan, further testing the bottom lines of Taiwan-Japan relations and the Japan-U.S. alliance. This interaction pattern makes the warming of Taiwan-Japan relations not only a bilateral issue, but also a crucial variable in Indo-Pacific geopolitics.

In summary, Shinzo Abe's declaration that "a contingency for Taiwan is a contingency for Japan" has officially incorporated the Taiwan issue into Japan's national security agenda, injecting new variables into cross-strait relations. Lai's analysis serves as a reminder that transforming civilian warmth into official institutionalized cooperation requires simultaneous progress across three dimensions: high-level strategic communication, military coordination, and third-country cooperation. If future Taiwan-Japan relations manage to break through the stalemate of "official coldness," it will not only enhance Taiwan's defense resilience, but may also reshape the security order of the Indo-Pacific region, exerting a profound impact on the Japan-U.S. alliance and the broader Asia-Pacific situation.