Let me add my own point of view:
I watched the documentary "China-Vietnam self-defense counterattack" on the Internet the other day. From this, I understand why Vietnam wants to cross the border to harass the border of China's southern provinces, which is explained in detail in the film. The reason is that after the Vietnam War, Vietnam, which was in urgent need of new things, was unified, and its rectification ambition expanded, so it began to wage war to gain more benefits. Then it invaded Cambodia and Laos successively, intending to restore the "zhina Peninsula" imagined by the French! Therefore, in the international environment where China and the Soviet Union turned against each other and China and the United States established diplomatic relations, Vietnam began to harass the southern border of China at the instigation of the Soviet Union until 1979 when China officially sent troops to teach Vietnam a lesson! Of course, we didn't do anything about Vietnam, so we called their capital Hanoi and went back to China. 10 years later, with the disintegration of the Soviet Union, the ambitious Vietnam really died down and maintained its present situation!
Having said that, I just want to take a stand! Today's North Korea and South Korea, that is, the balance point of East and West powers! In other words, when the eastern powers are strong, the western powers will take out the North Korean issue to contain it! Closer to home, today's China is getting stronger and stronger, and the United States will use the "Taiwan Strait issue", "North Korea issue", "East China Sea issue" and "South China Sea issue" day and night to curb the development of China! It also includes splitting Tibet and Xinjiang and so on! Of course, China is not weak enough for you to bully me, so I will use foreign exchange to buy his US Treasury bonds, so there will be a certain balance between the two big countries! You can't take advantage of me and I can't take advantage of you! Just like Vietnam, the United States launched the Vietnam War to curb the expansion of Soviet forces in Southeast Asia. The Soviet Union encouraged Vietnam to harass China's southern border and obstruct the establishment of diplomatic relations between China and the United States! That's the truth! The Han dynasty is a pawn of the great powers of the East and the West! Unless the east and west are in decline! They will have a peaceful reunification one day! In other words, there will be no large-scale conflict at this stage, and there will be no real dialogue for the country! It is best to maintain the status quo!
I hope this answer will satisfy you! Absolutely original! ! ! ! ! ! ! !