Best alternative is to intercept one of their missile during testing, and then to spread the news of this great "victory" over the medias.
But this is only a temporary solution; next step will be all sismic detectors on the planet detecting an underground nuclear test...
KJong will troll continuously and require american troops to "do this or to dont do that" etc... Will be an harassement...
Theres no issue, US is on decline and cant afford to lose face against NK, or NK+China, or investors may finally consider China as a good destination; and it could cost much more than doing measures against China right now.
Trump would never accept to handle the responsability of this defeat: he will push to war; not to mention he could finally get some approval, like BushW did.
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I bet China is largely behind that (UN voting is a joke in their game) for several logic reasons.
The solution is to immediately destroy NK, cutting regime head eventually, or to threat China of true serious trade measures.