Is the emigration from China to the Russian Far East rising gradually?

First of all, Russia's s-400 and Su -35 air defense systems exported to China are definitely for export, and their performance is definitely not as good as their own use. Moreover, Russia already has s-500 and stealth aircraft. He must have kept himself safe. Immigrant, China can't immigrate on a large scale. China people have always had a strong national consciousness, and foreign governments have always had a bad impression of immigrants from China. There have been one or two Chinese exclusion incidents abroad. Moreover, it is impossible for the territory to come back. Since the end of World War II, several agreements have stipulated that neither Russia nor the international community will allow the return of the Far East, which is a challenge to international law. He just wants to rely on China's strength to develop now, but he can't let his fate be in the hands of others.