Japan's Defense Spending Exceeds 2% and the Revision of Three Security Documents in 2026 Will Change the Practicalities of the Japan-U.S. Alliance

According to reports dated November 3, the Japanese government is seriously considering a significant increase in defense spending and the revision of three security-related documents by the end of the year. While the sheer size of the numbers can be distracting, from the perspective of the Japan Maritime Self-Defense Force, what is being questioned is not the budget amount itself, but how that budget will be linked to which missions and at what pace.

Equipment and Operations Beyond 2%

The 2022 National Security Strategy and other documents indicated a direction to raise the level of defense capability to 2% of GDP. According to the Congressional Research Service (CRS), the Takai administration may revise the National Security Strategy by 2026, placing emphasis on artificial intelligence, inexpensive drones, and cyber defense. This is not merely about increasing the number of vessels or aircraft. It is a concept of connecting satellites, drones, long-range missiles, and command and communication into a single firepower network to continuously monitor the situation from dispersed bases in the southwestern islands.

• Defense Spending: Increase based on the 2% of GDP standard
• Key Areas: AI, unmanned assets, cyber, intelligence gathering
• Alliance Challenges: Connecting Japan-U.S. goal setting and engagement decisions

New Frictions in the Japan-U.S. Alliance

Japan's increased burden aligns with the role-sharing that the United States seeks from its allies. However, an enhancement of capabilities does not automatically translate to the effectiveness of joint operations. Even if the integration of Japan's intelligence collection and analysis capabilities through the National Intelligence Agency and the National Security Council progresses, if the data formats, classification levels, and authority to issue orders do not align with those of the U.S. military, the surveillance and monitoring of the southwestern region could result in a situation where "we can see it but cannot act."

The crisis recognition indicated in the Ministry of Defense's 2026 Defense White Paper is based on the premise of simultaneously addressing deterrence against China, North Korea's missiles, and Russian activities. However, there are limits to the number of vessels and personnel in the Maritime Self-Defense Force, and it will not be possible to simultaneously expand the escort of SLOCs (Sea Lines of Communication), ballistic missile defense, and resupply to the southwestern islands. If expensive equipment is prioritized, the less visible aspects such as maintenance personnel, ammunition, and training days will likely become bottlenecks.

Political Risks That Are Easily Overlooked

While an increase in defense spending can be a condition for deterrence, it is not deterrence itself.

The most important aspect of revising the three documents is not to write strongly about threats, but to clarify at what stage the Self-Defense Forces will make decisions and what information will be shared with the U.S. military. From both capability and intent perspectives, the Chinese side is likely to observe operational rules and the sustainability of logistics rather than the total budget amount. In my view, the true weakness lies not in financial resources, but in the speed of political decision-making to shift the increased equipment from peacetime vigilance to wartime command.

Main Information Sources Referenced

• 'The Japan Times' November 3, 2026 "Japan gets serious about defense spending hike as year-end deadline looms"
• Congressional Research Service (CRS) "Japan’s Evolving Defense Policy and the U.S.-Japan Alliance"
• Ministry of Defense of Japan 'Defense of Japan 2026'