The rapidly aging Russian population is not only shrinking but is not fit for any major economic or military efforts. During the last decade it was discovered that some 60 percent of Russians are elderly, children, or disabled. Out of 20 million males of working age, one million are in prison, a million in the armed forces (including paramilitaries), five million are unemployed (or unemployable due to poor education, health, or attitude), four million are chronic alcoholics, and a million are drug addicts.
Thus there is something of a labor shortage, with plenty of jobs for women and immigrants. The birth rate is below replacement level and a declining population means more immigrants just to keep things going. Improving medical care and health habits (especially treating alcoholism and drug use) is a government priority, in order to raise the life span of Russian males. That has had some success, and in urban areas you see more Russians out running and going to the many newly built private gyms. But these improvements are not happening quickly enough to reverse the population decline.
If this trend is not reversed, Russia will continue to have a smaller, and less Russian, population.