Well NK has committed to denuclearization[1], while the US also talk about denuclearization[2].

In general, that is what makes half of foreign policy reporting semi-useless, newspapers rarely report in which sense diplomats use the words. (Compare "fighting terrorist" as claimed by everybody, in general terrorist is just defined by threatening the interests of the speaker.)

[1] Likely meaning a mutual, synchronous and long term reduction of nuclear weapons towards a global zero goal. (Like the stated US nuclear policy of the Obama administration.)

[2] Meaning a prompt and unilateral abolishment of the NK nuclear program, as in Libya.