For 70 years, Japan has been one of the world's largest defense industries with one of the smallest export markets. That changed on Tuesday in Tokyo. Prime Minister Sanae Takaichi unveiled a sweeping rewrite of the country's arms export rules, the biggest overhaul since the postwar pacifist framework was put in place.
Warships, missiles, ammunition and integrated weapons systems can now be sold abroad under a regular licensing process, not as exceptions.
What the reform changes
Until now, Japanese defense companies could mostly export only components, parts and dual-use technologies. Finished weapons systems were case-by-case, politically fraught, and rare. The new rules drop that distinction. Mitsubishi Heavy Industries, Kawasaki Heavy Industries and IHI, the three core defense primes, can now bid into open international tenders for warships, fighter jets and missile systems.
Three forces drove the change. The war in Ukraine has stressed US weapons production beyond its current capacity. The Iran conflict has pulled American assets toward the Persian Gulf. And second-term Trump's reluctance to underwrite long-standing security commitments has pushed allies in Europe and the Indo-Pacific to look for second sources.
Takaichi: "No single country can now protect its own peace and security alone. Partner countries that support each other on defense equipment are necessary."
The industrial base reads
Japan's defense industry has been quietly preparing for this moment since the 2014 partial liberalization, but the volumes were always small. The largest deals to date have been Mogami-class frigates discussed with Australia and components for European missile programs. The new framework opens the gate for full-system exports across the buyer base.
For Mitsubishi Heavy in particular, this is a structural shift. The company already builds Aegis-equipped destroyers, the Type-12 anti-ship missile, and is the lead Japanese partner in the GCAP next-generation fighter program with the UK and Italy. Until now, all of that had a Japan-only customer. From this week, it does not.
The geopolitical signal
Beijing will read this as a clear move. Japan stops being just a host for US bases and becomes a defense supplier in its own right, plugged into European and Asian buyer demand. Seoul, Manila and Canberra are likely partners. Brussels and London are already in talks on co-development.
The 80-year taboo has not just been bent. It has been replaced.
Sources: CNN, Japan Today, The Straits Times
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