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The date 8 July 2016 is a momentous one for Northeast Asian security affairs. It was when South Korea’s Ministry of National Defense (MND) announced the government’s decision to allow US deployment of the Terminal High Altitude Area Defense (THAAD) system on Korean soil. This news reverberated around the world, as the implications of deploying THAAD go beyond the already dangerous Korean peninsula and impact on relations between the United States and China. This report discusses THAAD as not only a missile defense system but also as a diplomatic challenge.