Tim Kaine actually said...

Great nations are great peace builders. It was not just military power, and it was not just economic power. It was also a commitment to peac...

I cannot imagine the Kim Jong-un regime giving up its nuclear arsenal in any world.

North Korea wants some things. They have wanted a peace deal to end the Korean War rather than just an armistice.

I would say it is very hard to tell. I would give it a successful for as far as I can see from the actions and the words.