I think North Korea was bombed into the stone age in the 50's and sanctioned graciously to this day. They cannot last much longer and will probably give up next week or have a revolution that will install a 'good' government soon. Sanctions work.
South Korea is bravely defending from North Korea, though with great losses. Not a day passes by without a tragic report of civilians bombed in their homes, or attacked during an evacuation from a sieged city. Sanctions against North Korea just don't work, we have to finally gather an army to invade North Korea and end this dragging war.