Right after North Korea launched its round of missiles, I outlined a series of options, mostly financial, that the U.S. and other countries could take in response. Two weeks later, several aspects of that forecast are holding up well. What looked at first like another U.N. farce, then a modestly successful sanctions effort (by U.N. standards, anyway), now looks to be an important and hard-won component of a coordinated effort to tighten the squeeze on the regime-sustaining half of North...