let me turn to gary samore. do you see this question of flat-out this means what's been going on until now has failed? >> yes, i think that's right.h i mean, going back to president reagan, when we first suspected that north korea was pursuing a nuclear weapons program,a the united states has tried many different ways to slow down or prevent north korea from acquiring nuclear weapons, including nuclear diplomacy. we've had three agreements,, threats of preemptive war, economic sanctions. we've tried many different methods and they've all failed. as greg said, it's an indication of how difficult the problem is. you have a country that feels it has an existential need to have nuclear weapons in order to survive, and u.s. options,p whether they're diplomatic, coercive, military, are very limited. so the question will be whetherw or not this test of north korea's continuing defiance will create opportunities, in particular for the u.s. and china, to work together, and that will be seene in the u.n., whether or not t