We have. They are called Trident Subs that can hit them from most of the North Pacific. They are called Minutemen missles that can hit withing 200 meters of their target. These live in Wyoming, Montana, North and South Dakota. They are called cruise missles that can hit within ten feet of their target. These live on our subs and cruisers and destroyers. and B52s (BUFFs)
From the moment of launch any point in North Korea can be incinerated in as little as 5 minutes (cruise missle launch off their coast) or 30 minutes for a ballistic missle launch from the United States mainland.