Here is how South Korea has ended its dispute with China about the deployment of the THAAD battery to Seongju:
The recent agreement to restore relations between South Korea and China was achieved by having South Korea assuage China’s security concerns through public pronouncement of the “three no’s” – no additional THAAD deployment, no participation in the US’s missile defense network and no establishment of a trilateral military alliance with the US and Japan. But since the situation is liable to change with conditions on the Korean Peninsula and the interests of the countries concerned, it’s hard to say how the government’s promise of the “three no’s” will play out.There’s not likely to be a push for additional THAAD deployments under the administration of South Korean President Moon Jae-in. For one, opposition to THAAD deployment is the prevailing view among the Moon administration’s base of supporters.
Furthermore, since THAAD is designed to intercept enemy missiles at the high altitude of 40 to 150 km, it cannot defend the Seoul region, which is close to the armistice line, and can therefore only be deployed in the southern part of the country. Since one THAAD unit is already deployed in this southern area, there would seem to be little reason to deploy another. But if North Korea’s nuclear weapon and missile threat grows even more, South Korea could conceivably find itself under increasing pressure in a variety of ways to allow further deployment.Seoul’s declaration that it will not participate in the US missile defense network has been the government’s basic stance going all the way back to the Kim Dae-jung administration. This is in consideration of China, which suspects that the US wants to build a missile defense network in northeast Asia to neutralize China’s military.
In exchange, Seoul has announced that it will build what it calls “Korean Air and Missile Defense” through local development of M-SAM (medium-range surface-to-air missiles) and L-SAM (long-range surface-to-air missiles).But South Korea and the US are also hurrying to set up a system that would enable detection and tracking information of missiles launched by North Korea to be shared in real time to facilitate the effective interception of those missiles. This would mean linking South Korea and American missile defense by means of sharing information. Such steps would naturally cause South Korea to move toward participating in US missile defense, some argue.
There’s virtually no possibility of a trilateral military alliance forming between South Korea, the US and Japan. Given popular sentiment in South Korea, it’s hard to imagine a military alliance being signed with Japan. [Hankyoreh]
You can read more at the link, but I always find it interesting how many in the ROK treat the Japanese as the enemy when it is China that economically and diplomatically punished them over the past year. What makes it even worse is that the deployment of THAAD was to protect South Korea from a threat the Chinese helped to create in the first place. You would think there would be mass anti-Chinese protests about this, but the best the ROK has done is a one man protest. I guess everyone else in South Korea is to busy waiting in line to take their picture with a comfort woman statue.