Stolen Secrets: How China's J-20 Stealth Fighter Took Shape from U.S. Designs
China's Chengdu J-20 "Mighty Dragon" and the forthcoming Shenyang FC-31 stealth fighters are widely believed to incorporate stolen design elements from American and likely Russian fighter programs. In particular, a Chinese national named Su Bin was found guilty of conspiring to steal sensitive military information, including the designs for the F-22 and F-35, for the Chinese military.
See the full article at stlbeacon.org