That is the conclusion of Narang and Panda in the Times:
North Korea has arrived as a nuclear power, and there is no going back. Once the reality-show theatrics of the Singapore summit meeting subside, we are left with the reality that North Korea was just recognized as a de facto nuclear weapons power.
…. Didn’t he just agree to “work towards complete denuclearization of the Korean Peninsula”? He did. Just like his grandfather’s deputies did in 1993. That phrase — “denuclearization of the Korean Peninsula” — is a term of art that the United States and North Korea can interpret to suit their interests.
Any normalization of relations or easing of sanctions with North Korea will have implications for a number of African states (see here and here) that have enjoyed lucrative economic ties with Pyongyang (mostly through the import of arms and statues).