The (stated) goal of sanctions on North Korea was denuclearization. North Korea continued to do nuclear tests and haven't returned to NPT yet.
(And also to disable their ability to use nukes against USA).
I would say goals were accomplished. We really don't know the state of nuclear missiles there and I could bet they are not in any very good shape...
Truly, "nukes against USA" is much more ridiculous than Russia's excuse of invading Ukraine, that it is threatened by NATO expansion.
Russia is threatened by NATO expansion as much as I am being threatened right now of being attacked by a rabid bear
Why do you think so?