I think it is well understood that with the way political hierarchies are structured, economic sanctions always impact the people with the least amount of power

I think it is well understood that with the way political hierarchies are structured, economic sanctions always impact the people with the least amount of power before anyone of the insulated power wielding people at the top lose any sleep. I'm not even sure historically that economic sanctions have ever resulted in the proclaimed goals of the sanctions. How long have we had economic sanctions on NK? Has the result been our stated goals of the economic sanction?