AP Photo

A hot mic shouldn't overshadow a dirty bomb. The Nuclear Security Summit in Seoul ended recently with two dominant story lines: President Obama's "hot mic" comments to Russian President Medvedev and the 53 participating governments congratulating themselves on the summit's outcomes. Both miss the key strategic problem that the Seoul Summit did not address: the need to unify the current patchwork, largely voluntary approach to nuclear security that is not commensurate with the risk or consequences of nuclear terrorism.