That is stupid. We should either ignore the Norks, or, if we can’t, strike with overwhelming and massively destructive force.
Personally, I’d go for declaring a blockade, mining their harbors, destroying their rail links to China and Russia, and taking down any major bridges I could reach. Clamp down on the food and fuel, then sit and wait. If any one complains about “humanitarian issues,” tell them to go piss up a rope.
It’s impossible to start a humanitarian crisis in North Korea right now. The North Korean people are already eating grass. How much worse could it get for them?