We've discussed extensively in our book China at Its Limits (Deutsche Edition: China an seinen Grenzen) about the border challenges China faces, their historical roots and the future perspectives . We also warned you that the landmines and dangers in China's rise are hidden in these regions...
PRC's Foreign Minister Wang Yi just ended his 4-countries Europe tour with a visit to Germany. In a meeting with the German Foreign Minister Heiko Maas in Berlin, Beijing's policies on Hong Kong (the National Security Law) and in Xinjiang (Maas wants a UNI observer mission to visit the Uighur detention camps) were openly questioned. Maas also criticized Wang's "threats" against the trip of the Czech senate president Milos Vystrcil to Taiwan. Obviously a head-aching journey for Mr. Wang.
To read more about the German viewpoint in the FAZ: https://www.faz.net/aktuell/politik/ausland/schwieriges-verhaeltnis-europareise-des-aussenministers-von-china-16933267.html
To read more about the Chinese viewpoint of Wang's visit in German on Radio china International (where none of the unpleasant points are mentioned): http://german.cri.cn/aktuell/alle/3250/20200902/536467.html