response. >> the problem comes if north korea then retaliates in turn and you have a spiral of escalation. there is the possibility, hypothetically, that things could get so serious that we would become involved. >> retired general walter sharp commanded u.s. forces korea when the talks started on this new agreement. >> there's been a lot of work done between the republican of korea and the united states on provocation responses, what should we do if north korea does another kinetic attack? >> sharp says there's been intense planning to the right response to north korea's next provocation. >> that holds something at risk for kim jung unso he'll thing twice before another attack. >> in fact, north korea's leader kim jong-un recently threatened to wipe out south korean units on another border island.