Vladimir Putin has a much bigger long-term problem beyond Ukraine: Russia's population is shrinking, which for political scientist Ivan Krastev will impact how post-Putin Russia looks like because Putin won't let Russians even talk about it.

That's a big deal, he tells Ian Bremmer, because the West seems to be primarily focused on isolating Russia while dreaming of a post-Putin world ... without Russia.

Meanwhile, Krastev says the Russians are prepping for a future in which they deal with China instead of the West — which is equally far off for them.