China has a territory area of 9.6 million square kilometers. From 1858 to 1864, Russia invaded the territory of China1440,000 square kilometers through a series of border demarcation treaties such as Aihui Treaty and Beijing Treaty. 19 1 1 In February, 2008, Russia invaded China territory 1400 square kilometers through the Sino-Russian Manchuria Border Treaty. 19 1 1 year, Mongolia was "autonomous" at the instigation of Russia, and another 1565000 square kilometers of territory originally belonging to China was zoned out. In this way, Russia took away 2,996,400 square kilometers of our territory. Therefore, before 1840, the territory of China should be about 12596400 square kilometers.