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ジャスティン・ブロンク教授が英議会の2024/3/6の公聴会ではっきり答えている
https://committees.parliament.uk/oralevidence/14441/html/　のQ3
So one of the big issues is timeframe: if Saudi Arabia were to demand being a full, core partner member, that 2035 timeframe would not be possible, at which point the Japanese would leave the programme. That is an absolute requirement for them. I have spoken to very senior Japanese air force personnel who have said, in those terms, that 2035 is an absolute cut-off for them; it has to be ready by then. I suspect we would have a similar view if we were sat next to the PRC.

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