The US may want an interoperable BMD architecture with the ROK, but they continue to maintain they are going to develop their own BMD system:
Building an interoperable missile defense system is a key focus the United States places on trilateral cooperation with its two key Asian allies, South Korea and Japan, a senior American diplomat said.
Principal Deputy Assistant Secretary of State Anita Friedt made the remark at the Japan Institute of International Affairs in Tokyo earlier Friday, echoing what Assistant Secretary Frank Rose said during a recent trip to Seoul, according to the State Department.
“With regards to trilateral cooperation among the United States, Japan, and the ROK … Developing an interoperable regional missile defense architecture is an important future area of focus in light of the increasing nuclear and missile threats posed by North Korea,” she said.
“We believe that future trilateral cooperation between the United States, the ROK, and Japan can positively impact our deterrence efforts against North Korean aggression and send a powerful message of deterrence to the DPRK (North Korea),” she added.
The U.S. wants to build a regional missile defense with South Korea and Japan in a move that critics say is aimed not only at countering North Korean threats, but also keeping China in check. Seoul has said it will build its own Korean Air and Missile Defense System (KAMD) in a way that is interoperable with the U.S. system. [Yonhap]
You can read more at the link, but the ROK is trying to take the middle road on this to balance their relationship with China and the US. China doesn’t want an interoperable architecture so the ROK has maintained they will build their own missile defense system. However, as the article states the ROK’s KAMD system can be developed to be interoperable with the US if needed.