Didn't find this previously posted -

The best political commentary out of East Asia last week is the one published on December 15 by South Korea’s second largest newspaper, Dong-A Ilbo. The paper’s editors asked a question on the mind of the entire Korean nation after their president had been outrageously snubbed by the Chinese leadership during his four-day state visit to the communist country, and Korean reporters accompanying their president’s visit were savagely beaten by thuggish Chinese security guards: “China should reflect on this question: why is it that for such a big country, there is hardly any neighbor that can be described as China’s friend?”
The question is poignant. It reveals a spectacular vulnerability of China’s national security: China has no real friends along its long, vast land and maritime borders, and any Chinese aggression against any one of its many aggrieved neighbors will likely trigger a massive defense and military coalescence as well as a much stronger coalition of the willing against China.

This is indeed China’s Achilles heel.
https://www.hoover.org/research/chinas-achilles-heel