In other words, I think they're past the stage where the nuclear weapons program was primarily a tool to get attention and blackmail. Now it's primarily a tool to get nuclear weapons.
In the end, it's all about money and stability. Blackmail worked for a while, but the regime simply needs more income. Being the nuclear weapons Wal-Mart of the world will fix the income issue for decades.
But first, they need a working product.
Don’t they need time to tweak the device to make it smaller and more reliable? Can they do it in a couple of months?