Shinjiro Koizumi says Tokyo’s security shift is defensive, while accusing Beijing of building a vast and opaque arsenal that is unsettling the Indo-Pacific.
Japan’s defence minister has sharply rejected accusations that Tokyo is returning to militarism, using a major regional security forum in Singapore to turn the spotlight back on China’s expanding military power.
Speaking at the Shangri-La Dialogue, Shinjiro Koizumi dismissed Beijing’s claims that Japan is embracing a “new militarism,” arguing that the country’s postwar record, lack of nuclear weapons and commitment to international law undermine such accusations. Instead, he warned that China’s rapid military build-up, including its nuclear forces and strategic capabilities, is deepening insecurity across the Indo-Pacific.
The exchange reflects a worsening strategic rivalry between Asia’s two largest economies. Japan has been expanding its defence posture in response to what it sees as a more dangerous regional environment, shaped by China’s pressure around Taiwan, North Korea’s weapons programmes and Russia’s war in Ukraine. Beijing, meanwhile, has repeatedly accused Tokyo of abandoning its pacifist principles and reviving the militarist tendencies that shaped Japan’s wartime past.
Koizumi’s remarks were designed to rebut that narrative directly. He contrasted Japan’s defence policy with China’s growing arsenal, saying Tokyo does not possess nuclear weapons or strategic bombers and has maintained a security policy rooted in transparency, deterrence and cooperation with partners.
The speech also came as Japan seeks a larger security role in the region. Tokyo has increased defence spending, strengthened cooperation with the United States, Australia, the Philippines and other partners, and loosened long-standing restrictions on defence equipment exports. Japanese officials argue these changes are necessary to preserve a free and open regional order, not to project aggression.
China sees the shift differently. Its officials have warned that Japan’s expanding defence role risks destabilising Asia and have linked Tokyo’s current policies to historical grievances that remain politically powerful in China. Those tensions have been sharpened by Japanese comments on Taiwan, which Beijing claims as its own and has not ruled out taking by force.
Koizumi also expressed disappointment that he had not been able to meet his Chinese counterpart at the forum, indicating that Tokyo still wants dialogue even as it toughens its security language. China’s defence minister did not attend the event, limiting opportunities for direct talks at a time of rising mistrust.
The confrontation at Shangri-La underlines a broader shift in the Indo-Pacific. Japan is no longer relying solely on its postwar restraint as a shield against regional instability. It is increasingly presenting itself as an active security partner, while insisting that its military reforms remain defensive.
For Beijing, that evolution is a warning sign. For Tokyo, it is a response to a changing balance of power. The result is a growing war of narratives: China portrays Japan as drifting toward remilitarisation, while Japan argues that China’s own arsenal and lack of transparency are what make deterrence necessary.
As regional governments weigh the risks of conflict, especially over Taiwan, the dispute between Tokyo and Beijing is becoming more than a bilateral argument. It is a test of how Asia defines security in an era where military power, historical memory and diplomatic trust are increasingly colliding.
