Russia is the whitest country on the planet right now, and I can safely tell you that any Russian politician who tries to change that will swiftly become gone.
What is true is that the Russians would like a significant fraction of the empire back - and giving up the Far East to Chinese immigration is not part of doing that.
That would be somewhat true in the days of USSR because an average citizen didn't see the whole balance book (which republics are producers and which are consumers.) But dissolution of the USSR placed all these states into their personal Petri dishes, for all to see who is who. And the results are sad. Baltic states flaunt their Nazi past. Black Sea states returned to wars. Most of Middle Asian states resurrected Islam and went as far as possible from sanity. Cults of personality abound.
Now an average person can look at all that and say "no, thanks!" to any suggestions of taking those talibanized entities back into the union. It is plain obvious that these new members will be only asking for money and flooding Russia with their unemployed (and sometimes unemployable) people.
This is doubly so now because the old leaders of the USSR are gone. The new leaders (Putin particularly) are pragmatists, and they won't do anything stupid like inviting Uzbekistan back into the fold.
Besides, Russia already has more land that it knows what to do with. There isn't enough people in the country to develop the territory. That's where certain alliances with stable and educated countries like China and India may be of use.
With regard to Medvedev proclaiming that the future of Russia is with Asia ... look at Europe and see for yourself what it is. Europe is busy making sure that it has no future by killing jobs and bringing the fifth column in. China or India, on the other hand, have no illusions about Muslims - they approach the subject from a practical point of view, not from a euro-liberal multiculturalism.
But of course this statement will also give a hint to proud Europeans that they are not the only game in town.
There are alot more white people in the USA than there are in Russia.