North Korea, is probably South Korea, China, and Japans problem seeing as they such long history with each other.
Creating a nuclear weapon requires uranium, and that's not such a big deal if someone wants to sell it to them. I do have to wonder what it takes for someone to sell them an intercontinental ballistic missile silo system.
Same goes for the Arabs in many instances.
How or why would North Korea launch an attack against the USA?
Arabs, different story. Anyone who gives them the capacity to build nuclear weapons is surely going to be held responsible if a bomber ever made it's way into the USA with one on a plane, in a suitcase.
I wish I knew more about military culture, and why governments continue to push large amounts of resources, and raise people with the culture of war, however, I don't.
http://en.wikipedia.org/wiki/Conscription

Interesting map. I do wonder why the Ukraine abolished conscription in 2013.
Red is areas with conscription.
Blue is no enforced conscription.
Here is a descent map of Uranium mines. I have no idea if it is complete, but it seems it all comes from Canada.
http://en.wikipedia.org/wiki/Uranium_mining

I don't know alot about Uranium, but the geology of that area in Canada to my understanding is an huge ancient impact crater.
http://en.wikipedia.org/wiki/Carswell_crater
Carswell is an impact crater within the Athabasca Basin of the Canadian Shield in northern Saskatchewan, Canada.[1] It is 39 kilometres (24 mi) in diameter and the age is estimated to be 115 ± 10 million years (Lower Cretaceous). The crater is exposed at the surface.
The Cluff Lake uranium mine produced over 62 million pounds of yellowcake during its 22-year operating life.[2]
Oh shit, that's a dead??? mine in Saskatchewan, the map showing the world production of Uranium shows all the current uranium coming out of Canada in Ontario, Sudbury.
http://en.wikipedia.org/wiki/Sudbury_Basin
The Sudbury Basin, also known as Sudbury Structure or the Sudbury Nickel Irruptive, is a major geologic structure in Ontario, Canada. It is the second-largest known impact crater or astrobleme on Earth, as well as one of the oldest.[1]