According to this CNN article, Saudi Arabia is planning to "build a fence along its entire 560-mile (900-kilometer) border with Iraq to prevent terrorists from entering the kingdom from the chaotic north."
Seriously, a fence? Did anyone think that a fence between the US and Mexico would actually work to keep out Mexican immigrants, who, for the most part, are peaceful and only seeking gainful employment?
Iraqi terrorists, by definition, will be much more malicious and much more likely to be equipped with the kind of tools necessary to, say, cut a hole in the fence, or maybe even blow a huge hole in it.
I guess it's a good time to be in the fence-building business.