reporter: analysts say the hard line from one side of trump s administration with a softer approach from the other is a car rrot and stick tactic get north korea s dictator to stop acting so aggressively. you can see the dual track, defense and hard line on the one hand and diplomacy and engagement on the other hand. we re trying to bring north korea back to the negotiating table. but they say that could be a ric risky move depending on how kim jung unreads it. they may see the united states doesn t have a plan, is not committed to this and may be act ing in ways they re not comfortable with. reporter: the concern is all this diplomatic jockeying might lead kim jong-un or president trump or one of the allies in the region to miscalculate, take a signal the wrong way and launch a military action that