Japan’s latest defense white paper sends a message that goes well beyond Tokyo’s immediate security concerns: the country increasingly sees the Indo-Pacific as a connected military theatre where China, Russia and North Korea can reinforce one another.
The 598-page assessment again identifies China as Japan’s greatest strategic challenge, while warning about growing Chinese military activity in the Pacific, closer China-Russia cooperation and North Korea’s expanding missile capabilities and relationship with Moscow. Defense Minister Gen Nakatani has called for Japan to strengthen its capabilities with a “sense of urgency and crisis.”
The important shift is that Japan is no longer planning around one threat at a time. China’s military pressure around Taiwan and Japan’s southwestern islands is increasingly being viewed alongside Russian activity in the region and North Korea’s missile program.
The concern is that these powers do not need to form a formal military alliance to create problems for Japan. Greater coordination, intelligence sharing, joint exercises and the diversion of US and allied resources in one theatre could make it much harder for Tokyo and Washington to respond to a crisis elsewhere.
That is why Japan’s planned military expansion matters. The country has already pushed defense spending to around 2% of GDP, a major change from its traditionally restrained postwar defense posture.
The new strategy places greater emphasis on missiles, drones, artificial intelligence, unmanned systems and domestic weapons production. Japan has also selected four drone manufacturers for accelerated development, reflecting lessons from Ukraine and other recent conflicts where relatively cheap unmanned systems have changed battlefield tactics.
There is an economic calculation behind the military buildup too. Tokyo is increasingly presenting defense spending as industrial policy, arguing that investment in weapons technology can support Japanese manufacturers, startups and advanced technology companies.
That could create a new domestic defense industry capable of supplying more of Japan’s own military needs while generating commercial technologies that can be used outside the defense sector. The approach represents a significant departure from the idea that defense spending is simply an unavoidable cost of national security.
But there is an obvious danger in this strategy. More military capability can strengthen deterrence, but it can also accelerate an arms race across East Asia. China is unlikely to watch Japan expand missiles, drones and other capabilities without adjusting its own calculations.
North Korea has already used Japan’s military expansion and the growing US-Japan alliance as justification for its own weapons program, while Russia and China have repeatedly criticized what they see as the remilitarization of Japan.
The nuclear question makes the situation even more sensitive. Japan remains committed to its non-nuclear principles, but the worsening security environment has already generated renewed debate about whether the country’s traditional nuclear posture can survive indefinitely.
China and North Korea possess nuclear weapons, while Russia remains a nuclear superpower, leaving Japan increasingly dependent on the US nuclear umbrella. Any serious movement towards changing that arrangement would fundamentally alter the security balance in Asia.
For now, Japan is choosing conventional military expansion rather than nuclear weapons. It is also strengthening partnerships with countries such as Australia and the Philippines and deepening cooperation with the United States and other like-minded states. That suggests Tokyo’s preferred answer is not to fight China alone, but to make any attempt to coerce Japan or disrupt the regional order significantly more expensive.
The bigger issue is what happens if every major power in the region reaches the same conclusion. China sees US alliances as containment. Japan sees Chinese military expansion as its biggest strategic challenge. North Korea sees US-Japan-South Korea cooperation as a threat to its survival. Russia is increasingly coordinating with China and North Korea. Each side can therefore describe its military buildup as defensive while the other side sees it as preparation for confrontation.
That is the dangerous cycle Japan’s new defence paper is really revealing. The Indo-Pacific is moving towards a security environment where deterrence is becoming more important, but where every attempt to strengthen deterrence can also increase the possibility of miscalculation.
Japan’s decision to accelerate its military transformation may therefore be necessary from Tokyo’s perspective, but it also means Asia is entering an era where the consequences of a single military incident could be much larger.
