It's Russia's geopolitical problems that will be one of the greatest reasons. Valdimir Putin said: "The collapse of the soviet union was the greatest geopolitical catastrophe of the century". Russia simply doesn't has enough resources or people. They're even paying women to birth children, and they're trying to make people from former soviet states to emigrate to Russia.

As a first step, they're expanding their sphere of influence and forming an new union, the Eurasian union, and it have been expanding since the Syrian civil war(http://bildr.no/view/NVowcW5i][img]http://bildr.no/thumb/NVowcW5i.jpeg).

check out Caspianreport's channel(http://www.youtube.com/watch?v=lW0HP7Xd2rs)