The recent history of UNSC-imposed sanctions to end nuclear weapons programs is, well, um….just read.
“UNSCR 1441:”:http://daccess-ods.un.org/TMP/976316.779851913.html Iraq mostly complied and was increasing its compliance when the US-led invasion happened in early-2003. And Iraq had no WMD.
“UNSCR 1172:”:http://daccess-dds-ny.un.org/doc/UNDOC/GEN/N98/158/60/PDF/N9815860.pdf?OpenElement It’s pretty hard to say that either India or Pakistan has complied. Pakistan is a major non-NATO ally and the United States has obviously been improving its relations with India (as have a lot of other governments).
Yes, that’s condensing some complex history, but I think you get the point about compliance/response.