Good luck trying to get the ROK to reorient any of their defense strategy towards China. The ROK received large economic retaliation from China just for hosting a U.S. THAAD. Could you imagine the retaliation if the ROK started reorienting defenses such as long range strike missiles towards China?:

Many South Korean defense capabilities could contribute to deterring an assertive China, a senior Pentagon official said Tuesday, stressing that the United States’ defense priorities should focus on addressing the “most serious” military threat of the Asian superpower.
Deputy Assistant Secretary of War for East Asia John Noh, the nominee for assistant secretary for Indo-Pacific security affairs, made the remarks in his written answers to advance questions from the Senate Committee on Armed Services, asserting the need for South Korea and other allies to “dramatically” increase their defense spending and take greater responsibility for regional security.
“While the ROK should focus primarily on leading the U.S.-ROK alliance’s conventional deterrence against the DPRK, many capabilities could also contribute to a deterrence of China,” Noh said. ROK and DPRK stand for the respective official names of South Korea and North Korea, the Republic of Korea and the Democratic People’s Republic of Korea.
“Capabilities, such as long-range fires, integrated air and missile defense, space and electronic warfare capabilities, could provide a meaningful impact to strengthen deterrence in the region against both threats,” he added.
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