1858, the Sino-Russian Aihui Treaty ceded 600,000 square kilometers of land south of Outer Xing 'an Mountains and north of Heilongjiang.

1860 The Beijing Treaty between China and Russia ceded about 400,000 square kilometers of land east of the Wusuli River, including Sakhalin Island.

1864 The Sino-Russian Northwest Boundary Demarcation Treaty ceded about 440,000 square kilometers of land to the east and south of Lake Balkhash.

After the demise of the Qing Dynasty, the Tangnu Wulianghai area in the northwest of outer Mongolia has about 6,543,800 square kilometers of land.

From 1858 to 1946, the former Soviet Union and the later Soviet Union directly cut off1700,000 square kilometers of land from China through military aggression and diplomatic deception. Coupled with the independence of Outer Mongolia instigated by it, * * * made nearly 3.3 million square kilometers of land leave the embrace of China, accounting for a quarter of the total territory area in the heyday of the Qing Dynasty.

The development of history

17 14, the Russian Orthodox Church Beijing Missionary Mission began to station in Beijing, taking into account diplomacy in addition to missionary work. 186 1 year, Russia formally established the legation in Beijing. 1887, the Qing government set up an official embassy in Russia in St. Petersburg. 1900 participated in Eight-Nation Alliance's invasion of China in an attempt to occupy northeast China.

Since the Qing Dynasty in China, Russia has occupied many territories in China by means of wars, treaties and conspiracies, and it is the country with the largest territory in China. The Russian-occupied territory of China includes (from east to west): Sakhalin Island, the land east of Wusuli River, the land north of Heilongjiang to the outer Xing 'an Mountains, the land east of Lake Baikal, Tangnuu Liang Hai and so on.

Statistics on the territory area invaded by Russia: western Xinjiang and outer Manchuria are about 6,543.8+0.5 million square kilometers, Liang Hai in Tangnu is about 6,543.8+0.7 million square kilometers, and outer Mongolia is about 6,543.8+0.5 million square kilometers, totaling about 3.3 million square kilometers.

Baidu Encyclopedia-Sino-Russian Relations