Why It Matters
A recent Congressional Research Service report on Japan's shifting security posture examines one of the country's most significant strategic recalibrations in decades, with implications for how the U.S.-Japan alliance functions and how regional power dynamics may evolve. The link originally provided for CRS report R47831 was incorrect; that report concerns the House “Gephardt Rule,” while the Japan report is CRS Insight IN12708, Japan’s Evolving Defense Policy and the U.S.-Japan Alliance.
Japan is fundamentally reshaping its military and intelligence infrastructure after decades of constrained defense policies. The changes signal Tokyo's intent to shoulder greater security responsibilities in the Indo-Pacific, a shift that affects U.S. strategic planning in the region.
For the Trump administration, the developments present an opportunity to distribute security responsibilities more broadly across the alliance, while potentially creating complications if Japan's growing military footprint contributes to regional tensions. CRS specifically notes that Japan's more assertive posture could allow it to play a larger role in the alliance in line with the Trump administration's calls for allies to assume greater responsibility for their own security.
The Big Picture
Japan established a more centralized intelligence apparatus through legislation passed in May. The National Intelligence Bureau (NIB) coordinates intelligence collection and analysis across government ministries and serves as the secretariat for the National Intelligence Council (NIC), which is chaired by the prime minister. The changes address what observers had described as a fragmented intelligence system with limited coordination and intelligence sharing among agencies. Japan also intends to establish a foreign intelligence agency to collect information abroad.
The NIB and NIC formally launched July 31, after the CRS report was published. Prime Minister Sanae Takaichi's government announced the launch, and the prime minister's office documented the unveiling of the NIB that day.
The intelligence overhaul sits within a broader defense transformation. Japan has upgraded intelligence-collection capabilities, removed restrictions on arms transfers, and expanded cooperation with regional partners. Under its revised defense export policy, Japan may export lethal arms to 17 countries with which it has defense equipment and technology transfer agreements, provided those countries are not engaged in active conflict.
A reciprocal access agreement between Japan and the Philippines entered into force in September 2025, providing a framework for Japanese forces to operate in the Philippines. CRS notes that the agreement allowed Japan to dispatch its forces to the Philippines for the first time since World War II. Japan's Foreign Ministry says the agreement facilitates joint exercises, disaster relief, and other cooperative activities between the two countries' forces.
Defense spending commitments anchor these changes. Prime Minister Sanae Takaichi and her two immediate predecessors committed Japan to nearly doubling defense spending to 2% of gross domestic product between 2023 and 2028, according to CRS. The government's revised national security strategy is expected to emphasize artificial intelligence, inexpensive unmanned assets, and cyber defense. Japan has also been developing and operationalizing counterstrike capabilities, or the ability to strike targets in an adversary's territory.
The Bottom Line
The U.S.-Japan alliance was forged after Japan's defeat in World War II as a fundamentally asymmetric arrangement in which the United States assumed primary responsibility for Japan's defense while Japan hosted U.S. military forces and maintained significant constraints on its own military power.
Japan's accelerating defense and intelligence reforms are making that arrangement less asymmetric, potentially giving Tokyo a larger role in regional security and forcing U.S. policymakers to consider how the allies should coordinate capabilities, intelligence sharing, defense production, and cooperation with regional partners.
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