North Korea has an official ideology of "Juche", and "The goal of Juche is to establish a self-reliant state" (1)
It may not be like that in practice. But nevertheless, self-reliance is in their stated goals, and North Korea is one of the least "open" states in the world.
I think you can make the case that they "try to be self-sufficient". They do try.
As for Israel, eh, it depends. They certainly don't rely on neighbouring countries.