They kept the peace by allowing NK to continue to develop effective nuclear weapons.   Seems easy, basically kicked the can down the road for someone else to deal with when they actually become a threat.  Neither smart nor courageous on their parts.  What would you have the US do now - make another Clinton deal?  Has NK ever actually negotiated and followed through?  Have they ever responded to sanctions?  It is time to force their and China's hand before their capability expands any further.