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東京とロンドン両方の記事な
https://www.reuters.com/business/aerospace-defense/exclusive-britain-japan-aim-merge-tempest-f-x-fighter-programmes-sources-2022-07-14/

Britain and Japan are close to an agreement to merge their next-generation Tempest and F-X fighter jet programmes, with the two countries aiming for a deal on a new joint project by year-end, three sources told Reuters.

Japan's partnership with Britain is a chance for BAE and other European Tempest companies, such as Rolls-Royce (RR.L), missile maker MBDA and Italian defence group Leonardo (LDOF.MI) to tap a growing market long-dominated by U.S. companies.