Japan’s Shift from the Yoshida Doctrine to the Takaichi Doctrine: The Start of the Japanese Active Deterrence — Bloomsbury Intelligence and Security Institute (BISI)
AI Analysis
Japan has significantly altered its post-WWII defense policy by abolishing restrictions on arms exports, moving away from the Yoshida Doctrine and embracing a more active deterrence posture under the Takaichi Doctrine. This shift includes the export of lethal weapons, including combat drones, to countries with existing defense technology transfer agreements. Japan is substantially increasing its defense spending, becoming the world's tenth-largest defense spender.
Key Takeaways
- Japan revised its Three Principles on Transfer of Defence Equipment and Technology, allowing for the export of lethal arms (including combat drones).
- The policy change is driven by China’s military expansion, perceived US alliance reliability concerns, and a need to bolster its defense industrial base.
- Japan’s defense budget for 2026 is 9.04 trillion yen ($58 billion USD), a 61% increase over the last decade.
- The government is revising its National Security Strategy (NSS), National Defence Strategy (NDS), and Defence Buildup Program (DBP) to support this new posture.
- Japan will monitor the end-use of exported arms and will not trade with countries currently at war.
Why It Matters
This represents a major strategic shift for Japan, signaling a willingness to play a more assertive role in regional security and potentially becoming a key defense supplier in the Indo-Pacific. The move will likely increase regional tensions and pressure ASEAN nations to clarify their alignment in the US-China rivalry, and could lead to increased competition in the global arms market. The increased defense spending and focus on operational readiness indicate a preparation for potential conflict scenarios.
Japan’s Shift from the Yoshida Doctrine to the Takaichi Doctrine: The Start of the Japanese Active Deterrence — Bloomsbury Intelligence and Security Institute (BISI)
Japan’s Shift from the Yoshida Doctrine to the Takaichi Doctrine: The Start of the Japanese Active Deterrence
Asia Pacific Diplomacy and Security
13 May
By Nicole Pitassi | 13 May 2026
Summary
On 21 April, Japan’s arms export revision abolished decades of restrictions that limited trade to non-lethal categories, and marked the most significant change of its post-WWII pacifist framework. The shift was driven by China’s military expansion, the Trump Administration’s transactional approach to alliances, and an unfavorable self-defense industrial model.
The decision reflected a structural break from the Yoshida Doctrine, with the Takaichi government converting Japan’s industrial capacity into means of exchange to meet the United States' new National Security Strategy (NSS) demands and position itself as a defense supplier to partners questioning their dependence on the US.
Japan’s entry into the Indo-Pacific security market is pressuring ASEAN states to make explicit alignment choices they have so far carefully avoided in the US-China rivalry.
Context
Since the end of the Second World War, Japan has acted as a pacifist nation, following the Yoshida Doctrine, which prioritised economic development while relying on the United States (US) for security. Essential to this stance were the Three Principles on Transfer of Defence Equipment and Technology, which, since 1976, had banned the export of lethal arms. However, on 21 April, 2026, Prime Minister Sanae Takaichi’s Cabinet formally revised the Three Principles, removing the restriction. The new revisions now allow Japan to export lethal weapons, including warships and combat drones, that are currently being sold to 17 countries, which signed defence equipment and technologies transfer agreements with Japan. Prime Minister Takaichi has made clear Japan’s intention to remain a pacifist nation, and the exports of lethal arms must be approved by the National Security Council, and their use will be monitored by the Japanese government. Furthermore, Japan stated that it will not trade with countries that are at war.
This decision was made following a broader increase in defence spending. Japan’s defence budget for the fiscal year 2026 was set at 9.04t yen(58b USD), up from 6.8t yen (43.4b USD) in 2023. In 2025, Japan spent 9.8t yen(62.2b USD) on defence, which was a 9.7% increase from 2024 and a 61% increase over the decade, positioning Japan as the tenth-largest defence spender globally.
On 28 April, the Takaichi government held an expert panel to revise Japan’s three core security documents: the National Security Strategy (NSS), the National Defence Strategy (NDS), and the Defence Buildup Program (DBP). The current revision is expected to bring the country to operational readiness through the deployment of long–