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As we all know, Japan and Russia have not been dealing with each other because of the ownership of the four northern islands, the so-called four northern islands include the four islands between Japan's Hokkaido and Russia's Kamchatka Peninsula, which Russia calls the South Kuril Islands. Because of the geography of the four northern islands. So this place has been in constant dispute. After World War II, the Soviet Union actually took control of the place, and there was peace after that. But when Japan wanted to reconcile with the Soviet Union, the United States threw up the problem, and the dispute between the four northern islands came out. But because the Soviet Union was powerful, Japan had nothing to do. Why, then, didn't Japan take advantage of the internal chaos at the time of the collapse of the Soviet Union to seize the four northern islands? There are mainly a few reasons.
The first reason is that although the Soviet Union collapsed at that time, Russia inherited most of the Soviet Union's armed forces, and its military strength did not weaken, although there were problems in Russia's economy at that time, but it was still a thin camel bigger than a horse. If Japan wanted to capture the four northern islands, it would have to send troops, but after World War II, Japan could only fight on its own and was not allowed to send troops abroad to fight. And with Japan's self-defense force of only 100,000 people, it is difficult to compete with russia, which is militarily powerful.
The second reason is that the Soviet Union's occupation of the four northern islands is legal, and in World War II, the United States asked the Soviet Union to send troops and signed the "Yalta Agreement", in which it was stipulated that wherever the Soviet Union fought, it belonged to the Soviet Union, during World War II the Soviet Union laid down two islands, and after the surrender of Japan, the Soviet Union occupied two more islands, so the Soviet Occupation of the Northern Four Islands was legal. If Japan had claimed sovereignty over the four northern islands and forcibly occupied the four northern islands at the time of the collapse of the Soviet Union, it would have been an illegal invasion, and even the United Nations would not have agreed to it, because it was simply a disguised overthrow of the agreement between the victorious powers in World War II.
The third reason is that after World War II, Japan, as a defeated country, signed a peace constitution, according to which Japan cannot attack other countries, and if Japan forcibly occupies the four northern islands when the Soviet Union disintegrates, it will be an enemy of the whole world, and the United States will not help Japan. Moreover, helping Japan has no benefit to the United States, so without the support of the United States, It is even more impossible for Japan to forcibly occupy the four northern islands at the time of the collapse of the Soviet Union.