The move has stoked fears in China, which believes deployment of the Terminal High Altitude Area Defense (THAAD) system could help Washington to expand its military power in the region.
"Deployment of the THAAD system needs to be seen in the perspective of national defense and security," Defense Minister Han Min-koo said Jan. 25 during an interview with a local TV station. "There is a limitation to our capabilities, so there is a military need for a thorough review of the THAAD."
His comments came on the heels of South Korean President Park Geun-hye's support for the THAAD deployment.
"The deployment of THAAD will be considered based on our security and national interests and also by taking into account the North's nuclear and missile threats," Park said in a Jan. 13 national address.
"A deployment of THAAD is an inevitable option now for South Korea given the escalating threats of North Korea's missile technology," said Kim Dae-young, a research member of the Korea Defense & Security Forum, a Seoul-based private defense think tank.
"THAAD is designed to intercept missiles at an altitude of 40 to 150 kilometers using a hit-to-kill approach. That means there are double chances to shoot down incoming missiles," he said. "Combining the THAAD with the country's low-tier missile defense network is expected to create a synergy effect in enhancing deterrence against the North."
The cost for deploying the THAAD batteries is a hot button issue. South Korean defense officials said at least two THAAD batteries should be deployed to help thwart the North's missile attacks.
Operating a single THAAD unit is estimated to cost about $1.6 billion. One unit consists of six truck-mounted launchers, 49 interceptors, a fire control and communications unit, and an AN/TPY-2 radar.
"The issues of costs and sites for the THAAD deployment are expected to cause controversy domestically, as well as backlash from China," the defense analyst said.
China shows discomfort about the potential deployment of THAAD in South Korea.
Chinese Foreign Ministry spokesperson Hua Chunying said that even when pursuing their own security, countries "should take into account others' security interests as well as regional peace and stability."
"THAAD deployment could bring a severe shock to the security status quo that exists between China and the US, as well as with Russia," said Chinese analyst Zheng Jiyoung of Fudan University.
Fighter Project Starts
South Korea began its multibillion-dollar project to develop an indigenous KF-X fighter jet over the next decade.
On Jan. 21, the Defense Acquisition Program Administration (DAPA) and Korea Aerospace Industries (KAI), main contractor for the KF-X program, held a meeting to launch the fighter development project.
KAI is supposed to develop six test fighters by 2021 before the full-scale development begins by 2026, according to DAPA officials.
"KAI will manufacture 120 fighter jets from 2026 through 2032 to replace the Air Force's aging fleet of F-4 and F-5 fighters," DAPA Commissioner Chang Myung-jin said.
Indonesia is a key partner for the KF-X plan, financing 20 percent of the development costs. The Southeast Asian nation will also be entitled to acquire the aviation technology of the project and bring home one experimental airplane.
Jeff Jeong was the South Korea correspondent for Defense News.