In ancient China, there was a saying called "one dynasty and one courtier", one heavenly son and one weather, which means that the country's policies will fundamentally change with the difference of leaders. This makes national policies constantly repetitive and affects national development. The most typical is that during the reign of Stalin in the Soviet Union, he was friendly with our country, but after Khrushchev came to power, he became at odds with our country, so that in the following decades, our country did not side with the Soviet Union, indirectly accelerating the disintegration of the Soviet Union. In addition to This is Vietnam, during the 24 years of Ho Chi Minh's reign, Ho Chi Minh has always been grateful to China and friendly to China, but why did Le Son come to power for 17 years but strongly oppose China? There are three main reasons for this.
Modern Vietnam has been under French colonial rule and was occupied by Japan during World War II. After World War II, with the help of our country, Ho Chi Minh formed Vietnam's party organization and government, became the leader of Vietnam, and then began a 24-year rule. During the 24 years of Ho Chi Minh's reign, Ho Chi Minh visited China dozens of times and has always been grateful for China's help to Vietnam, so he has always been friendly to China and regards us as a big brother.
So the relationship between the two countries, in these 24 years, has been very harmonious, and China is also constantly assisting Vietnam, which is a honeymoon period. But after Ho Chi Minh's death in 1969, Lê Duạn succeeded him as supreme leader. But after 17 years on the throne, Li Sun turned sharp and began to fiercely oppose China.
After Li Sun came to power, he began to attack overseas Chinese and ethnic Chinese, driving 200,000 Chinese back to China, confiscating their property, and causing huge casualties. More seriously, during the Ho Chi Minh period, the islands that belonged to China were quietly occupied by Li Sun and did not recognize this agreement, resulting in the loss of China's islands in the South China Sea.
Moreover, Li Sun also believed that Guangxi and Guangdong were Vietnamese, and since then he has continued to provoke wars and continue to oppose China until his death. Many people do not understand that Ho Chi Minh insisted on being friendly to China for 24 years, so why did Li Sung, who reigned for 17 years, resolutely oppose China? In fact, there are three reasons for this, which you may not think.
First, arrogance.
Li Sun is arrogant and arrogant, basically looks down on anyone, a bit of a good great achievement, and the meaning of solipsism. When he was young, when he was sent to visit our country, he expressed contempt for our country. Moreover, he has always believed that the Americans have led their own troops to fight and run, so they think that the Vietnamese army is invincible in the world, and the neighboring countries should submit, even our country. It can be said that Li Sun's anti-China is linked to his arrogant and arrogant personality.
Second, the soviet union's encouragement.
After Le Son came to power, by 1975 the United States withdrew its troops, so Le Son had great ambitions, believing that Vietnam's strength could already be compared with the world's first-class powers. For this reason, it is completely invisible and denied the selfless assistance and vigorous assistance of our country in the Vietnam War, without which Vietnam would have been occupied by the United States long ago. But Le Duong did not think so, and he thought it was precisely the bravery of the Vietnamese.
Therefore, it believes that Vietnam can seize the opportunity to achieve the ambition of dominating Southeast Asia and replacing China as a great power in the East. At this time, the Soviet Union did not like our country, so it has been supporting and advocating this ambition and idea of Li Sun. Moreover, Li Sun looked down on China, but he had great respect for the Soviet fighting nation, so as soon as he hit it off, Li Sun began to oppose China when he came to power.
Thirdly, resentment towards our country.
After Le Son came to power, because of the easing of the Vietnam War and the difficulties of our country at that time, the assistance to Vietnam was reduced. For this reason, When China's relations with the United States were normalized in 1972, Lê Tần believed that our country had betrayed Vietnam and submitted to the West. And Li Sun hates the United States the most, which makes Li Sun hate our country very much.
At this time, China was just unstable at home, and it was destitute, and Li Sun believed that China was vulnerable, so he insisted on opposing China. After the war was waged, and after the counterattack against Vietnam, Lê Thanh also declared vietnam a victory and drove away our country. Since then, with the support of the Soviet Union, it has continued to confront and oppose China in the border areas.
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References: History of Vietnam, Modern and Contemporary World History.