The government as a whole will promote appropriate overseas transfer of defense equipment under the Three Principles on Transfer of Defense Equipment and Technology, which permits transfer of defense equipment in cases such as the transfer contributes to Japan’s security. In order to do so, based on progress and other elements in defense cooperation with our partners, the Government will make necessary improvements in implementation or related rules...
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...Furthermore, MOD/SDF will actively promote international joint development and production with other countries utilizing Japan’s technological strengths.
Три принципа: Украина вроде не подпадает под запрет
First Principle: Cases where transfers are prohibited (clarification of standards)
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Cases where the defense equipment and technology are destined for a country party to a conflict (a country against which the UN Security Council is taking measures to maintain or restore international peace and security in the event of an armed attack)