Handyman
Hug someone you care about...
I wouldn't go so far as to say "nothing" will work. We could conceivably turn NK into a parking lot. That would stop proliferation. We could probably give the Kim's a trillion dollars. That could conceivably work. The question is how much less carrot and/or less stick would actually still get something verifiable done? The situation is somewhat different than in the 90's, although there are many similarities. (US politics is still an obstacle, for example.)
The main thing though, as always, is China. China cutting 81% of cash and goods inflow has really squeezed the Kim's and that's perhaps different this time around. Obviously they can't bleed the peasantry any more than they already are to pay for their Beamers, Hookers, and Coke, so they are again getting in a very tight spot between being broke and having 3 or 4 US Carrier Groups under the control of a lunatic on their doorstep every few months. Now if China doesn't bail them out, there's at least some possibility to make some progress.
Like the 1992 Joint Declaration on Denuclearization of the Korean Peninsula between NK and SK, the Agreed Upon Framework was, by definition, a non-binding political commitment of a few pages. As opposed to say the Treaty on the Non-Proliferation of Nuclear Weapons, which was binding. Not that it's that significant in retrospect, as NK violated all of them.
True war could work, but I was speaking diplomatically. I abhor war.