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US–Japan negotiations

The JASDF and its contractors considered developing a Japanese-designed, Japanese-produced replacement for the aging Mitsubishi F-1 fighter as early as 1981. A formal feasibility study commenced in 1985.
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As the program began to take formal shape in 1985, several United States officials raised concerns
that the program would result in an inferior aircraft, and would weaken the U.S.–Japan defense relationship.

https://en.m.wikipedia.org/wiki/Mitsubishi_F-2
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