Russia itself is under severe pressure from China. Evidently China is pulling the same thing on Russia that Mexico is on us. The Chinese are sneaking across the border in large numbers. Some are already talking about Russia becoming a much smaller state as it's estern territory morphs toward a Chinese populace.
As for the other nations you mentioned, for all the good it will do, they just as well be ignored.
Russia is indeed threatened by the Chinese encroachment, to say nothing of separatist movement in the Islamic parts of Southern Russia. What you may see is a contracted, but leaner and meaner, Russia in the relatively long-term future. I think the struggle of Russia will not be so much one of Third World immigration, but the revitalization of the spirit of the Russian peoples. The declining birthrate is certainly a negative; the budding re-spiritualization and return to its Christian roots is a positive.
The same can be said of the other Eastern nations of the Continent as well. Ultimately, I believe mass Third World immigration will be the downfall of the West; assuming Russia and Eastern Europe avoid that, I think they will compete with East Asian nations for global supremacy.
I would also add Spain, Portugal, Iceland, and, considering recent developments, possibly Denmark to my list as well.