What territories of China were returned by the USSR? To say that the USSR returned the territory of China, it is better to say that the dog does not eat.
Of course, some of them were returned, for example: Black Blind Island, etc. As for Sakhalin, don't think about it, after the collapse of the Soviet Union in 1991, Russia ** became the de facto controller of Sakhalin.
Why? However, from a historical point of view, or from the attitude of the Soviet Union towards China at that time, it was basically mainly aggression, and the appetite for the territory of other countries was great!
For example, the Battle of Yaksa between 1685 and 1688 was a war between the Qing Dynasty and Tsarist Russia. The cause was the attempt of the Tsarist Russian invaders to occupy the territory of Northeast China and their continuous expansion to the south.
The Qing army, under the leadership of Emperor Kangxi, counterattacked the Russian invaders and eventually succeeded in recovering Yaksa and other territories.
The Soviet Union was the victorious power after World War II, and at the Yalta Conference in February 1945, Stalin made two demands on Japan in the Far East
The first was to cede South Sakhalin Island to the Soviet Union, and the second was to internationalize the port of Dalian, and at the same time merge the Middle East Railway and the South Manchurian Railway to be jointly operated by China and the Soviet Union. These demands of the Soviet Union were tacitly approved by the United States.
China** agreed to this condition due to its weak national strength and various reasons.
In 1945, the Soviet Union signed the Sino-Soviet Treaty of Friendship and Alliance with China, which stipulated that the Soviet Union's territorial claims in the northeast would no longer be raised.
In 1946 they were actually reoccupied again.
In 1955, the Soviet Union once again renounced these territorial claims and returned them to China, in fact, the territory of the Northeast was originally Chinese, and it did not matter how to return it.
The real return to China is the Black Blind Island. Also known as Fuyuan Delta, it is located in Hei Blind Island Town, Fuyuan City, Jiamusi City, Heilongjiang Province, China, on the southwest side of the main channel at the confluence of the Heilongjiang River and the Ussuri River.
Later, the break between China and the Soviet Union was also related to territory, such as the Battle of Zhenbao Island in 1969, which was to occupy this place. Therefore, don't think too well of the Soviet Union, eat more and occupy more, it is the truth of the Soviet Union.