Haegung has been related to the development of Cheongung, a surface-to-air missile (SAM) system with technical support from Russia's Almaz-Antey and Fakel, that can intercept targets up to an altitude of 15 km at a range of 40 km.
South Korea has strived to develop an independent three-tier aerial and missile defense system, based mainly on Russian technology. A low-tier missile defense system was in the final phase of development.
The Cheolmae 4-H L-SAM, based on the Russian S-400 technology, is an upper tier interceptor to offer capabilities similar to that of the Terminal High Altitude Area Defense (THAAD) system, an advanced missile shield deployed by American troops in South Korea. Because U.S companies are reluctant to transfer technology, South Korean developers have forged strategic partnerships with Russian firms