We did go to war after a certain amount of UN resolutions. Of course, Iraq did not have nukes and developmental ICBM capabilities--that may be the big difference in terms of delaying or forestalling our actions on this one.
I believe, in the usual sense of belief as a state of knowledge somewhat short of proven reality, that nothing will be done unless N Kor or Iran detonates one or more of their nukes outside their own territory.