Can other countries back out of their F-35 commitments?
https://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning... (UK)
https://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning... (Italy, Netherlands)
https://en.wikipedia.org/wiki/Lockheed_Martin_F-35_Lightning... (Canada, Denmark, Norway, Turkey)