Britain and Japan join forces on next-generation fighter engine

次期戦闘機（Ｆ−Ｘ）に係る国際協力について
https://www.mod.go.jp/j/press/news/2021/12/22b.pdf

Britain and Japan join forces on next-generation fighter engine
https://www.defensenews.com/global/europe/2021/12/22/britain-and-japan-join-forces-on-next-generation-fighter-engine/

日英でエンジン実証機開発へ、次期戦闘機　来月開始 産経新聞
https://news.yahoo.co.jp/articles/66110c860217187aa286308438cb8037d1a17a21