Defence Minister Koizumi told the BBC the shift is meant to prevent war, with Australia selecting Japanese warships and the Philippines, Indonesia, and New Zealand in talks for defence hardware.
Japan is selling warships and lethal weapons abroad for the first time in roughly 50 years, a post-World War Two institutional break that Defence Minister Shinjiro Koizumi frames as regional deterrence but that rewrites Japan's self-imposed limits on arms trade.
In an interview with the BBC, Koizumi said strengthening Japan's defences was "critical" to prevent war and described the new posture as combining Japan's own military buildup, reinforcement of the US alliance, and expanded collaboration with like-minded countries (BBC, June 2026). The framing is the government's. The substance is an export pivot that changes who can buy Japanese military hardware and what they can buy.
Australia has already selected Japanese warships under the new track. The Philippines is in talks for used destroyers from Japan's Maritime Self-Defence Force, the country's navy in all but name. Japan is in "deep talks" with Indonesia on defence transfers, and New Zealand is next (BBC, June 2026). The legal change that made all of this possible is the relaxation of decades-old arms export rules. For the first time in about 50 years, Tokyo can sell or transfer defence equipment and lethal weapons to the 17 countries with which it has signed formal agreements, including the US and the UK.
The shift goes beyond equipment. It marks a re-evaluation of Japan's post-1945 pacifist posture, which rests on Article 9 of the constitution, a clause that renounces war and the threat or use of force as a means of settling international disputes. Koizumi told the BBC the regional arms trade is "something we have never seen before" (BBC, June 2026). That assessment is not about Japan alone. It describes a network being built among countries in the Indo-Pacific, the region stretching from Japan through Southeast Asia to India including Australia, where Koizumi says rising friction with China and North Korea has made defence cooperation more urgent.
Prime Minister Sanae Takaichi's government, which came to power in October 2025, is pushing to revise Article 9, the central political fight that runs underneath the export policy. Whether the constitutional revision succeeds is uncertain. What is already in place is the legal architecture for arms transfers and a list of named counterparties prepared to buy.
Critics inside Japan argue the export pivot pulls the country toward an arms race and abandons a post-war identity that, for decades, gave Japan a distinct diplomatic register in Asia. Supporters counter that without the policy change, Japan would be a passive consumer of regional insecurity.
The open questions are concrete. Which systems beyond warships will Japan export, and on what terms? Will the destroyer talks with the Philippines close, and at what cost? What does Indonesia want, and what is Japan willing to sell? And if Article 9 is revised, does the constitutional language change, or only its operational interpretation?
What to watch next: the Indonesia deal, the Philippines destroyer transfer timeline, and the parliamentary schedule for Article 9 in the Diet.