This is a dying ethnic faction. It only existed as a circumstance of war anyway. In 50 years, what will be left of “俄罗斯族" are foods, scant traditional architecture and whatever else you can find in museums. There'll be no Russian language, no Russian Orthodox religion, and no semblance of Russian heritage in typical life aside from the aforementioned food and perhaps one single tradition or two that held through the ages. In 50 years, "非洲族" will be the new 56th ethnicity.