Very Thoughtful And Probably Right

A new theory explains why neighboring countries invade one another: elites worry about the domestic attraction of the neighbors political institutions.

It certainly applies to Russia-Ukraine.

If this turns out to be right - and it makes complete sense - it explains why many of our Middle East policies fail -- or at least run into furious opposition and often incite wars.

The lesson is you probably should play to win or not get involved at all.