How are the four northern islands recorded in history? Why did it become a disputed territory?

Because the ownership of the four northern islands has always been a controversial issue between Japan and other countries.

The four northern islands are Japan's names for islands, but in Russia's eyes, it is called the South Kuril Islands, which is located in the northwest Pacific Ocean, close to Japan and Russia. The total area has reached more than 5000 square kilometers. For a long time, Russia and Japan have been arguing over the ownership of these islands. The earliest period can be traced back to Japan. During the Edo shogunate, four northern islands were developed. At that time, the Japanese had emigrated to the islands, and Russia began to expand eastward and began to move on Nanqian Island. Since then, the two countries have frequently clashed on the issue of island ownership.

After the conflict, the two countries also signed a treaty. At first, these islands belonged to Japan, and later they belonged to Russia. After the Soviet Union sent troops to Japan, the Soviet Union once owned four northern islands, but Japan never gave up the struggle for the ownership of the four northern islands. After calling on tens of thousands of troops to occupy these islands, the two countries argued over the rights of these islands for many years and even launched a war. However, after the victory of the Soviet Union, the ownership was not signed in the treaty.

A few years later, the ownership of the four northern islands is still a problem, and the Soviet Union and Japan have been negotiating on the ownership. However, due to the great differences between the two countries, no agreement has been reached.

In 2004, Russia asked Japan for the ownership of these islands, but Japan refused. After the disintegration of the Soviet Union, Japan arrogantly occupied the four northern islands. In this way, several countries have been negotiating for the ownership of the four northern islands, but opinions have never reached an agreement, and diplomatic conflicts have occurred many times. So far, the ownership of the four northern islands is still a problem.