hydrogen bam br head to get on an icbm which could targets the united states is the game-changing aspect of what happened today. >> so this morning, the president of the united states was asked if the u.s. would attack north korea, and this was his response, some see as rather ominous. saying, "we'll see." what does that mean and how might that be interpreted on the world stage? >> reporter: well, the president showed ambiguity there, of course. now, in the past over the last month of this escalating tension, he has been more bullish, if you like, towards pyongyang, talking about fire and fury. talking about locked and loaded, and then you had a sort of counter-message from his defense secretary-general james mat iti they say there's room for negotiation. now north korea has shown it is not going to abide by any of the negotiators' demands, to