You mean those missiles lockheed martin had in the 70s? That LM is working with DARPA on now that other countries have caught up? The missiles we already have a working defense system for?

Those missiles?

Chinese hypersonic missiles are dependent on American technology smuggled to China through Chinese companies because "American technology — such as highly specialized aeronautical engineering software — fills critical gaps in domestic technology and is key to advances in Chinese weaponry."

That's how. Smuggling. Normal, boring smuggling.

https://www.washingtonpost.com/national-security/2022/10/17/china-hypersonic-missiles-american-technology/