VD> South Korea appears to understand this, as it certainly doesn't want any part of the Taiwan question.
South Korea would be mad to cross China's Taiwan redline, of course. Small powers use more passive aggressive means to threaten a regional hegemon.
Gnews predicts on May 22:
South Korean President Moon Jae-in and Joe Biden may discuss on abolishing the U.S.-South Korea missile guideline, according to a senior South Korean official accompanying Moon on his U.S. trip.
South Korea is prohibited from firing ballistic missiles with a range of over 800 kilometers under the guideline. And Dr. Guan reminds the audience that the distance from Seoul to Beijing is 952 kilometers.
The lifting of the missile guideline has a deterrent effect on its Communist neighbors and the cost of short-range ballistic missiles would be greatly reduced with the participation of Korean companies.
Nikkei confirms on May 24:
U.S. restrictions on South Korea's ability to develop missiles have been lifted under an agreement reached by the leaders of the two countries.
"I am pleased to announce the termination of the missile guidelines," South Korean President Moon Jae-in said following his meeting with American counterpart Joe Biden in Washington on Friday.
Under the U.S.-South Korea missile guidelines, which date to 1979 and the government of Park Chung-hee, Washington agreed to the transfer of related technology to Seoul in exchange for caps on the range and payload of ballistic missiles.
The restrictions have been relaxed over the years at the request of Seoul. The payload cap was eliminated in 2017 while a range limit of 800 km remained. South Korea's Hyunmoo-4 ballistic missile is capable of reaching northeastern China and western Japan.
"If the development of midrange missiles capable of reaching China and Russia becomes possible, those governments would be expected to react," said an article in the Chosun Ilbo daily newspaper's online edition Saturday.
I'm sure Beijing Biden did not want Seoul to have ballistic missiles capable of targeting Beijing. Trump, on the other hand…
Gnews argues that Xi's top priority for retaining power is to prevent the bombardment of Beijing. It is easier to send a thousand farmers to die than to inconvenience one fellow mandarin.