"Well, I find it curious that a third country would presume to make strong representations about a security system that has not been put in place and that is still a matter of theory," Russel told a group of reporters in Seoul after meeting with his South Korean counterpart Lee Kyung-soo.
"Our military authorities have a responsibility to consider systems" that can protect U.S. and Korean citizens from Pyongyang's missile threat.
"Our military authorities" should imply the ROK and US military authorities, thus the ROK has a responsibility not only to consider systems but also to purchase and deploy systems to protect its citizens from the north Korean missile threat and not depend solely on the US for missile defense. In fact the ROK, as a responsible government, should deploy its own systems and join the integrated missile defense network to properly protects its citizens.
The bottomline in regards to Chinese opposition is that the ROK/US military alliance has the right of self defense and if the Chinese do not like the Alliance deploying defenses to deter and counter the north Korean threat they would be better served to help eliminate the threat from the north. No nation should ever succumb to external pressure that would violate one of the fundamental functions of a government: to provide for the common defense of its people. That is exactly what China is asking the ROK to do and by extension the US.