From the perspective of world history, for the relationship between countries, in fact, many times it is very unstable. And even that's ever-changing, with hostile nations becoming brothers, such as Iran and Iraq, while at the same time, friendly nations suddenly turning their faces into enemies. The most typical is China and Vietnam, which have always been friendly brothers, why did Vietnam suddenly turn its face in 1978? In fact, there are only four words for the reason.
Vietnam was once a territory of our country in ancient times, and it ruled internally for more than a thousand years, and although it was independent since then, it was also a vassal state and did it for more than a thousand years, so it can be said that the relationship is very good. After World War II, the United States and France made a comeback and wanted to reoccupy Vietnam, so our country tightened its belt to help Vietnamese a large amount of grain, weapons and equipment were continuously transported to Vietnam. In addition, our country has even sent troops to support logistics, send commanders, conduct military training and guidance ...
It can be said that it is meticulous, all-round guarantee, during the Vietnam War, our country's efforts are unprecedented. If Vietnam had not had our help at that time, I am afraid that it would have perished directly long ago, and there is no doubt about this. So in fact, until now, the relationship between China and Vietnam has been very close, which is certain.
But in 1978, only 3 years after the end of the Vietnam War, why did Vietnam suddenly turn its face to China? In fact, the reason is very simple, there are only four words, that is, "hegemonic ambition." In fact, after the Vietnam War, the Vietnamese top brass was basically carried away by the victory, completely ignoring China's help, thinking that they were very powerful and even the United States could defeat it.
Therefore, Vietnam's top brass, especially the military leadership, is even more contented and ambitious. Moreover, after 20 years of war, Vietnam had obtained a lot of advanced military equipment from the United States in Vietnam, and many of the equipment was not even available to China. Therefore, Vietnam's hardline military leaders advocate striking iron while it is hot, practicing hegemony in the Indochina Peninsula, and realizing their millennium ambitions.
At this time, China supported Cambodia, Laos, Myanmar, etc., and negotiated with Vietnam, and curbed Vietnam's ambitions, making the upper echelons of Vietnamese hardliners believe that China is an obstacle to Vietnam's hegemony and must be eliminated. At the time, Vietnam believed that China was far weaker than the United States, so it was possible to defeat China. Moreover, at this time, the Soviet Union provided a large amount of assistance to Vietnam, and also constantly encouraged Vietnam, encouraging Vietnam's ambition to dominate, so that Vietnam could not control its own ambitions at all, and began to expand extremely.
Therefore, Vietnam believes even more that defeating China makes Vietnam, the small China, the strongest country in Asia, a real greatEr China, and the whole once-in-a-lifetime opportunity is coming. So Vietnam began to turn its back on China, not only in the country a large number of Chinese exclusion, but also constantly provoked China to occupy Cambodia and Laos. Ready to take over China, so in 1978 began to completely turn the other cheek, which was actually the result of the expansion of the ambitions of small countries.
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Reference: History of Vietnam.