I wish they had cited some evidence that countries are failing their nuclear projects rather then just asserting it. I can think of countries that stopped their nuclear programs for diplomatic or economic reasons and I can think of countries that had their nuclear programs halted by outside means but off hand I can't think of one that failed.
Hmmm. I could access the full article, but it seems that based on the intro that maybe they are suggesting that it is so difficult because of the diplomatic and economic environment, not in spite of them. All the experts in the world are powerless if you don't have access to bomb-making materials.