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同じ日の別メディアの記事
https://asia.nikkei.com/Business/Aerospace-Defense-Industries/U.K-Japan-Italy-seek-to-hasten-next-gen-fighter-jet-roll-out
実証機は現在イギリス単独でやってるけど、日本とイタリアの参加を協議してる

Pointing out that Japan had, together with Mitsubishi Heavy Industries, already built a demonstrator called Mitsubishi X-2 Shinshin which took its first flight in 2016, BAE Systems Tempest Program Director Neil Strang said, "If there are opportunities to leverage some of that learning experience, why would you not?"
He added they are talking to both Italy and Japan, "making them feel very part of the demonstrator to see what role could they play, but discussions are ongoing."

日本が実証機の開発に参加すればX-2の経験を無駄にしないで済むという自信満々の発言