Implications
The economic logic behind the export ban lift is to boost production volumes, lower per-unit costs, and add manufacturing capacity that could be used in a potential military crisis. Japan’s major defence contractors—Mitsubishi Heavy Industries, Kawasaki Heavy Industries, Fujitsu, Mitsubishi Electric, and NEC—have historically relied on the Self-Defence Forces as their primary customer, resulting in sophisticated but high-cost systems due to limited scale.. With the removal of the ban, Japan is entering a substantial global market. World military expenditure reached $2.8t in 2025, growing 41% over the past decade. The current 17 accepted export partners include major defence spenders like the US, Germany, India, and Australia, with the latter having already signed a $6.5b fregate contract with Mitsubishi Heavy Industries. However, the economic benefits will be gradual as the companies will need to build export infrastructure, certification pipelines, and skilled labour capacity before being able to meet growing volumes.
A deeper implication concerns the US-Japan alliance. Japan’s postwar security strategy traded autonomy for security, restraining its military expansion under Article 9 of its constitution, in exchange for US protection under the Security Treaty. Japan interpreted the shift in US security posture as a break from this arrangement, replacing a values-based alliance with a transactional model based on tangible contribution. Therefore, arms export capacity is part of what Japan can now offer to the US and sustain its coalition. The Trump administration’s increasingly unpredictable approach toward longstanding partners has led many US arms importers to question their defence dependence on the US. Japan is likely positioning itself to serve that demand, attracting Southeast Asian (ASEAN) and European nations, including Poland and the United Kingdom, and building a network of security interdependence it believes necessary for deterrence in the 2030s.
Chinese Foreign Ministry spokesperson Guo Jiakun stated that China will resist Japan’s moves toward “a new type of militarism”. Its objections are rooted in the 20th-century events, where Japan acted as the aggressor, and claims that Japanese arms exports to ASEAN countries holding claims over the South China Sea would shift the regional military balance. Objections have also been found domestically, where over 36,000 protesters gathered outside the Diet to oppose both the arms export revision and the push for constitutional revision, and former Self-Defence Forces officer Makoto Konishi warned that these changes amount to “the gradual construction of a war–oriented framework” that will not only increase public anxiety but also “put Japan on a dangerous path”. Furthermore, the export revision coincided with Chinese naval activity near Japanese territory, reinforcing Japan’s perception of threats that are supporting its changes in the defence structure and risking a loop in which each side’s defensive measures register as offensive escalation to the other, supporting Konishi’s claims.
The most significant long-term constraint on Japan’s defence transformation is the structural fiscal context, as Japan’s government debt stood at 248.7% of GDP in 2025 and the Ministry of Finance projected that next year’s interest payments on government bonds will reach 30t yen (202b USD).
Japan’s arms export revision is redefining the terms on which Japan participates in the Indo-Pacific security environment. By entering the global arms market, Japan is shifting its industrial capacity into a medium of exchange for alliances, it is diversifying its security partnerships, and gaining leverage in contingency planning that treaty commitments cannot provide anymore. These changes are also reshaping Japan’s stance as a regional actor, where it is no longer acting as a passive beneficiary of US deterrence but as an active deterrent stakeholder, which acts as an invitation for ASEAN nations to deepen security ties with Japan as an alternative or complement to both the US and China.