Gonna need more than a couple destroyers to do that job.
I don’t know if it’s even possible but I would think it would take a lot of US assets to do the job all in one strike.
My thoughts would be long range, high altitude bombers to attempt to take out their air defense facilities first then the fighter bombers to focus on the specific ground targets such as military bases, depots, airfields. As far as any attempts by their air force to engage ours, they have absolutely nothing that even comes close to our fighters. Most of their planes would be considered "classic cars" from the 60's and some left over from the 50's.......
Lots of people don't realize that there are global trade sanctions against NK with food being the only allowed item. Their people are starving since the govt. cares nothing about the them and instead are using most of the foods to feed the military.
If a war were to break out, all food imports would cease, the people would be the first to suffer extreme starvation with the military close behind.
Their primary source for oil is China and if China is on board with the U.S., such fuel would cease and their military apparatus would run out of gas.