Despite the strong opposition of China, the United States and the Republic of Korea have agreed to deploy the Terminal High-Altitude Area Defense system in the ROK. Although the US claims THAAD is aimed at countering the "nuclear threat" posed by the Democratic People's Republic of Korea", it is actually targeted at China.

Why is THAAD's deployment in the ROK strongly opposed by China?

THAAD will undermine the regional strategic balance in East Asia and create more obstacles to the peaceful settlement of the Korean Peninsula nuclear issue. When the strategic balance of a region is broken, an arms race follows and regional disputes and conflicts intensify.