This sale is horrible for many reasons including military intelligence. However a lot of the responses seem a bit ignorant of the current state of things. I’m sure there are lots of key technologies in materials, aerospace engineering, and digital warfare let alone the strategic intelligence of capabilities. However, China also already has many of the F-35 plans, enough to build a version of their own in the J-35. These fighters are also no longer next gen fighters. They are current 5th gen. Both US and China are developing their next 6th gen fighters.