I don't understand. Wouldn't the mixing of both races (Caucasian and Asian) be a sign of positive integration? Borders are open. Canadians live all along the northern border of the U.S., and Hispanics along the south, our views between the three nations are generally similar, but we aren't afraid that we are going to be overrun by Hispanics.
Houston is the most diverse city in the usa. One of the highest percentages of Hispanic ethnicity due to its proximity to Mexico and the welcoming immigration policy of the U.S. And Arguably the single most booming economy in the United States right now. Is it due to Mexican immigration and unskilled labor, low wages etc? maybe. Probably more because of its location (port of Galveston, oil, etc), but it proves that Texas being overrun by "little muchachos" isn't ruining anything socially or economically. I could say "oh I don't want Mexicans in my country we are going to be overrun", and I would be in the same minority as the Slavs you characterized. We call them rednecks here in the USA, and thank god they are a minority right now. Just proves that spikes in legal immigration doesn't represent a sudden discordance between nations.
The United States doesn't dislike Mexico or Canada and a minority of Slavs calling immigrating Chinese "yellow men" and being concerned about increasing racial diversity doesn't speak for Russia as a whole, which I'm 100 percent sure is open and welcoming to the immigrating Chinese. It's all about the location of countries from one another.