It is worrisome that the Republic of Korea has agreed to deploy the US' Terminal High-Altitude Area Defense system on its soil despite the opposition from China and Russia. If the ROK ignores its neighbors' concerns and implements its agreement with the United States, what would be the consequences?

First, the ROK might lose a diplomatic leverage to negotiate with China on the Democratic People's Republic of Korea's nuclear issue. THAAD may facilitate the formation a US-ROK-Japan military bloc, which would affect China and Russia adversely and inadvertently make the situation advantageous for the DPRK, because Beijing and Moscow will lose the incentive to control Pyongyang's dangerous behaviors. In short, THAAD will cost the ROK an important diplomatic weapon in return for a military weapon.

After Park Geun-hye was elected ROK president, Seoul and Beijing seemed willing to transform bilateral relations into a more mature partnership. Economic relations between the two countries, including trade and investments, have developed faster than political ties. It is a pity therefore that instead of improving, bilateral political relations will suffer a blow because of THAAD. And some people in the ROK fear this could affect economic exchanges in the future.