The Terminal High Altitude Defense system set up at a converted golf course in Seongju has "early capability" to respond to North Korea's nuclear and missile threat, Defence Ministry spokesman Moon Sang Gyun said. He didn't say when Washington and Seoul expected THAAD to be operating fully.
The deployment has triggered anger from Seongju residents who fear North Korea may target their town and who worry about rumored health hazards linked to THAAD's powerful radar.
People also debate whether the security benefits of THAAD would outweigh possible drawbacks if relations worsen with China, which sees the system as a threat, and they have been angered by President Donald Trump's statement that he would make South Korea pay USD 1 billion for the system.
Critics question whether the United States and Seoul's caretaker government are rushing to set up THAAD before an election May 9 that will bring a change in the government in Seoul, which became necessary after Park Geun-hye was impeached and ousted from the presidency in a corruption scandal.
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Front-runner Moon Jae-in, a liberal who calls for engagement with North Korea, has said he would reconsider THAAD if he becomes president.
A statement circulated by North Korea's UN Mission says the government is ready to respond to any option taken by the United States.