The missile is said to be developed in the 1990s on the basis of the Russian S-300, but with a guidance system developed from the U.S. Patriot missile technology.
The missile is said to be developed in the 1990s on the basis of the Russian S-300's 5V55-series missiles. There are uncomfirmed rumors that the HQ-9 uses guidance system developed from the U.S. Patriot missile technology.