I'd recommend reading A Global Intelligence Briefing for CEOs. The mosting interesting part is that the birth rates in Europe and Japan are so low the countries risk imploding in the next few generations.
From the article:
The birth rate in Russia is so low that by 2050 their population will be smaller than that of Yemen. Russia has one-sixth of the earth’s land surface and much of its oil. You can’t control that much area with such a small population.
The native European population will be overtaken by the guest workers whose birthrate is so much higher.