China has described the recent comments from Japan Prime Minister Takaichi Sanae about Taiwan as crossing a red line, but in reality Japan’s position regarding Taiwan has remained fundamentally stable for nearly a decade.
The roots of the current debate go back to 2015, when late Prime Minister Abe Shinzo introduced a new political vocabulary that broke with previous caution by referring to Taiwan as an “important partner” and a “precious friend.” That shift marked the beginning of a broader reassessment of Taiwan’s strategic relevance for Japan, a process that continued through the 2021 Defense White Paper, which explicitly framed stability in the Taiwan Strait as essential for Japan’s own security, and has continued since then.
In this context, the tensions between Beijing and Tokyo need to be understood as the latest instance of a long-standing trajectory rather than an abrupt departure from it. What changed is not Japan’s strategic interpretation of a Taiwan contingency, but the clarity with which Japanese political leaders now articulate it.
The idea that a conflict involving Taiwan could qualify as a “survival-threatening situation” for Japan is fully consistent with the 2015 security legislation that expanded the conditions under which Tokyo can exercise the right of collective self-defense. Takaichi’s formulation falls within the logic embedded in those reforms.
This clarity, despite Beijing’s backlash, may reinforce deterrence in the Taiwan Strait by signaling that Taiwan may not be as isolated as China assumes. By reducing ambiguity regarding Japan’s future behavior, such statements can help diminish the risk of miscalculation in Beijing and strengthen regional stability.
Strategic view of Taiwan
Japan’s national defense has moved gradually toward the recognition that peace and stability across the Taiwan Strait are essential to its own defense planning. The shift began under Abe, who linked Taiwan’s security to Japan’s broader strategic outlook and encouraged a more proactive approach to Taiwan-related issues.
This evolution has translated into broader support from Tokyo toward Taipei in diplomatic, economic, and security domains.
Diplomatically, Japan and Taiwan resolved a long-standing point of tension in 2013 through a landmark agreement on fishing rights in the East China Sea. The agreement addressed overlapping territorial claims that had strained bilateral relations and demonstrated a shared interest in cooperation.
In the following years, Japan has also voiced support for Taiwan’s accession to the Comprehensive and Progressive Agreement for Trans-Pacific Partnership, framing this support through their close economic relationship and shared values.
Security interactions have followed a similar trajectory. On Sept. 25, 2024, a Japanese destroyer transited the Taiwan Strait for the first time since the establishment of the Japan Maritime Self-Defense Forces in 1954, which represented a meaningful signal regarding Japan’s readiness to operate in areas that have become increasingly sensitive. This development reflects a broader understanding in Tokyo that the strait represents a strategic environment that directly shapes Japan’s national security.
These adjustments in posture and discourse are reinforced by shifts in Japanese public opinion. Early polls show broad alignment with Takaichi’s assessment that a Taiwan crisis would create a survival-threatening situation for Japan.
Opinions regarding the exercise of collective self-defense in response to a Chinese attack remain more divided, with 48.8% in favor and 44.2% opposed. Still, surveys indicate consistent and rising concern about China’s militarization. In 2022, a majority of Japanese perceive China’s militarization as one of the most concerning issues for Japan’s peace and security.
This relatively favorable environment is also reflected in political support. Approval for Prime Minister Takaichi has risen to 69.9%, while backing for increased defense spending now exceeds 60%. These indicators reveal how Japan’s regional outlook has shifted and how domestic sentiment increasingly aligns with a policy framework that situates Taiwan as central to Japan’s own security.
Despite China’s reaction, Takaichi’s remarks remain consistent with Japan’s established approach, which has supported cooperation with Taiwan and emphasized stability across the strait. The intensity of Beijing’s response appears aimed at discouraging future statements of this nature from Japan and other democracies.
China’s reaction to Takaichi’s remarks developed into a multi-layered escalation campaign that targeted both political speech and Japan’s broader security posture. Xue Jian, China’s consul general in Osaka, reacted on social media by stating that “the dirty head that sticks itself in must be cut off,” a post that was later deleted.
Given the hierarchical structure of the Chinese Communist Party, the likelihood that such a message was expressed without prior authorization appears limited. The remark recalled the tone associated with wolf warrior diplomacy.
The diplomatic rhetoric was accompanied by concrete actions. Chinese vessels entered Japanese territorial waters near the Senkaku Islands, reinforcing pressure in an area that already represents one of the most sensitive points in the bilateral relationship.
China’s Ministry of National Defense warned that Japan would face a crushing defeat if it militarily intervened in a Taiwan conflict. Chinese authorities also advised their citizens to avoid travel to Japan and moved to suspend imports of Japanese seafood, further escalating tensions through economic instruments.
Taken together, these steps appear designed to convey a lesson intended to discourage Tokyo from making similar statements in the future. At the same time, the intensity of the response serves a broader purpose: to deter other democracies from articulating positions that publicly acknowledge Taiwan’s strategic relevance or signal readiness to assist in maintaining stability in the strait.
China’s reaction suggests limited interest in de-escalation at this stage, as this episode offers an opportunity to reinforce red lines and shape expectations regarding acceptable foreign discourse on Taiwan.
Building on Japan’s signal
The episode surrounding Takaichi’s remarks highlights an important development: Japan’s strategic view of Taiwan is now expressed with greater openness and confidence.
This evolution creates opportunities for deeper political and security engagement between Tokyo and Taipei as long as leaders who share this outlook remain in positions of authority. Taiwan can benefit from this momentum by strengthening channels of cooperation.
More importantly, Taiwan should avoid reacting in a way that could trigger an even bigger escalation, as this could dissuade future supporters from acting as Japan did. Instead, Taiwan should support Japan by trying to mitigate the impact of China’s retaliation.
For example, promoting travel to Japan, both rhetorically and by implementing economic incentives, could serve as a discreet measure to alleviate the potential impacts of China’s economic and diplomatic coercion. By endorsing a supportive approach, Taipei can ultimately reassure potential future supporters.
At the same time, other democracies have a role in reinforcing this dynamic. Clear and consistent support for Taiwan, expressed through diplomacy, economic cooperation, and calibrated security communication, can help reduce the likelihood of miscalculation by demonstrating that any attempt to alter the status quo by force would confront significant regional resistance.
A transparent acknowledgment of shared strategic interests, rather than sudden or improvised gestures, contributes to stability in the strait. Japan’s stance should therefore be more broadly supported to mitigate China’s coercive power while enhancing clarity in the Strait.
Japan’s more explicit articulation of its long-standing position signals a mature and coherent approach to regional security. If this clarity persists, and if partners reinforce it, deterrence in the Taiwan strait can become more robust, benefiting both Taiwan and the wider Asia-Pacific region.
