Why do Heilongjiang people look like Russians?

Descendants of ancient Russian immigrants to China. Russians in China are descendants of ancient Russian immigrants to China. At present, the total population is about 20 thousand, mainly living in the northwest of Xinjiang Uygur Autonomous Region and the north of Heilongjiang Province. After a hundred years of assimilation, except for appearance, other customs and habits are completely different from those of Russians. When communicating with our own people, we still speak Russian and use Russian, but we basically communicate with people in Chinese.