He's broken so much shit already, fixing this won't register. Besides, this "deal" hasn't happened yet and there's nothing formalized except Trump acting like he's already done it.
Also, there's no fixing North Korea until Kim is gone and the entire government has changed.
If by "fixing", you mean they'll never be able to fire a missile of any consequence at the US then maybe that's a fix -- but they weren't able to do that.
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