Japan in talks on BAE joining development of next-gen fighter jet - Nikkei Asia

Japan and the U.K. have already decided to collaborate on engine parts and aim to hammer out the specifics of expanded cooperation by the end of the year.

https://asia.nikkei.com/Politics/International-relations/Indo-Pacific/Japan-in-talks-on-BAE-joining-development-of-next-gen-fighter-jet