Example: Russia is nearly a catastrophe. The population is not replacing itself; suicide and alcoholism are rampant among men, and oil-based economy is in collapse.
Simultaneously China is starting to suffer some pretty bad economic problems itself. It is looking at all those resources in Siberia, which is part of Russia.
If we pulled our military out of the area -and Russia does not want us to do it - what would China do regarding Siberia? Try to take it over? Of course. Right now they are creeping in slowly like a turtle.
Realpolitik tells us we can't pull out military forces out of the area. On the other hand, I don't give a damn if Russia and China wipe each other off of the face of the Earth, so we should bring the American Empire home before it is forced home.
We're going to keep our forces over there. And that is why I hate Realpolitik and have for many, many years.