What is the source of the division between Sunnis and Shi‘ites, and how prevalent is this bifurcation in the Islamic world, a community of more than 1.6 billion?
Nuclear weapons have no real utility to North Korea other than as deterrence of attack or invasion. The threat of their development is a propaganda asset.
You wonder if the president might find himself singing a variant on Kermit the Frog's anthem about the burdens of being green: It's not easy being Barack Obama.