First of all, historical reasons. Historically, the Japanese killed the most people in China, while the Russians occupied the territory of China and plundered the most interests of China. China is connected with Russian territory, while China has a large population. Russia has only a population of more than 654.38 billion, and it also belongs to a country where the birth rate has been lower than the death rate for many years. Therefore, with the strengthening of China's national strength, the Russians are worried that China's huge population will regain its lost territory one day from the angle of having a guilty conscience.
Second, economic reasons. The sudden rise of any country's neighbors will cause its panic. As China's economy continues to strengthen, it makes Russia feel like a little brother, not a big brother. For example, it is far-fetched to refer to China, Indian, Russian and Brazil as BRIC countries, because they are not worthy to put shoes on China from a purely economic point of view, because China's GDP is more than their sum. There are so many wealthy neighbors who want to compete with China's economy. Russia's loss of heart is most obvious in Central Asia (the former Soviet Union joined the country and its sphere of influence), and people lack goals!
Third, military reasons. In the 1990s, Russia finally agreed to sell Su -27 fighter jets to China, but one of the conditions was that it could not fly over the Yellow River, which showed that it was still bitter about the ideological resentment of Sino-Soviet confrontation caused by the Cold War. After 30 years of reform and opening up, China's military progress is indeed enormous, which can be described as intergenerational development. Due to the cooperation with western enterprises in the form of market-for-technology and the huge military R&D investment brought by economic development, China's current military technology has quickly caught up with Russia and surpassed Russia in some fields such as electronics and materials.
Finally, historical reasons. The aggressive nature of the Russian nation is to sacrifice other countries and fulfill their own interests. Therefore, after the short honeymoon period, China and Russia confronted each other in the Cold War for a long time, and the border areas prepared for war all the year round, and a large number of military forces contained each other's borders. When China's nuclear weapons were successful, the Soviet Union took the initiative to propose that the United States jointly bombed China and completely destroyed China's nuclear forces. Paradoxically, during the honeymoon, the Soviet Union, which is close to you and me, tried to completely exterminate China with nuclear weapons, but failed to do so, because the greatest enemy at that time, the US imperialists, warned the Soviet Union that if nuclear weapons were used against China, it would be retaliated by the United States.
All these reasons are rooted in the national characteristics of China and Russia. There are no eternal friends in the world, only eternal interests. So when we look at politics, especially international politics, we must first understand the reality. Sooner or later, China will reach the first place in the United States and the only place in the world today. Sooner or later, it will use this overwhelming force to split Russia and recover the territory occupied by Russia in vain. What we are doing now is to join hands with the United States for the time being and give each other a strategic breathing space. In fact, the premature disintegration of the Soviet Union is also China's loss. Otherwise, the situation today is that the United States is still begging China to join forces against the Soviet Union, instead of freeing up its hands to impose a military embargo on China.
As for India, to put it simply, first, the territory is not connected; Second, the economic strength is equivalent; Third, Indians are "stupid", and their military capability can't be compared with that of China at all. In addition to producing many uneducated children with Indian divine oil, even the unified and qualified bullets can't be made, so Russia is not afraid of being copied when it sells advanced weapons to India. China taught Russia a profound lesson. The Russian Su -27 is not easy to sell now, which has a lot to do with the competition in China. Fourth, Russia still has a sense of superiority in front of India, because India is still rushing for the permanent members of the UN Security Council without veto power. On the other hand, China has not abandoned Russia. We are both founding members and permanent members of the United Nations. During the cold war, we vetoed each other. By way of digression, Stalin of the Soviet Union looked down on China and thought that China was not worthy to be a permanent member. In fact, American Roosevelt threatened that neither China nor the United States would be a member of the Standing Committee. He just pushed China to the position of global political leader among the four permanent members of the United Nations (before the French). It can be seen that the Soviet Union's hatred, contempt, extinction and enslavement of China have a long history, but the United States always lends a helping hand to China at some critical moments, so it is still an old saying: interests are eternal.
To sum up, the relationship between China, Russia and India can't be summed up in a thousand words, but it can't be separated from the word "benefit". In China-Russia, China-India, and Russia-India relations, everyone is laying out long-term strategies and striving for short-term friendship by making distant friends and attacking recent ones. We just can't take a one-sided view of the relationship between these three countries. We should take into account the Achilles heel of Russia in the European Union, the deadly enemy of China in Japan, the deadly enemy of India, and especially the United States, which dominates the world like a ghost.