The best - known instance was his dramatical denial of the existence of the Chinese stealth fighter J - 20 by exaggerating the American technological advantages .
He is also known for some of his belligerent comments to hide the real military strength of China .
The best - known instance was his dramatical denial of the existence of the China stealth fighter J - 20 by exaggerating the American technological advantages .
He is also known for some of his belligerent comments to hide the real military strength of China .