Are the four northern islands Japanese or Russian? How are they recorded in history?

In fact, whether the four northern islands are Japanese or Russian is recorded in history. The four northern islands are called the South Kuril Islands by the Japanese and the South Kuril Islands by the Russians. It is located in the Pacific Northwest, south of kamchatka peninsula, and is an extension of the Thousand Islands. The four northern islands are composed of Sedan Island, Guohou Island, Choishuo Island and Tooth Dance Island, covering an area of more than 5,000 square kilometers. All along,

Russia and Japan are constantly arguing over the ownership of this island, because both sides consider the four northern islands as their own national territory, and the four northern islands have also become a major obstacle to the further development of Japan-Russia relations and even affected the peace treaty between the two sides. In fact, in history, both Japan and Russia have developed the four northern islands. During the edo period, Japan began to immigrate to the islands. In the17th century,

Japan drew a map of the first four islands in the north, but at the same time. Tsarist Russia also started the strategy of eastward expansion, occupying a large territory north of Heilongjiang. After the South Kuril Islands, the two countries clashed on several islands in the Pacific Ocean, which also opened the battle for islands in the Pacific Ocean. In the next few years,

The two countries signed a friendship treaty, stipulating that the four northern islands were owned by Japan. This is the first time to determine the sovereignty of the four northern islands by contract, but in the following years, Russia and Japan signed a treaty again, and Japan handed over the four northern islands to Russia in exchange for the sovereignty of the Kuril Islands. In the subsequent battle, the sovereignty of these islands was divided by different factions and finally blurred, so that the two countries are still fighting for the sovereignty of this island.