I hadn't really thought about it before, but I believe North Korea has an 840 mile border with China, which is not hostile to them. So I don't understand how s

I hadn't really thought about it before, but I believe North Korea has an 840 mile border with China, which is not hostile to them. So I don't understand how sanctions by other more distant countries could meaningfully affect them if China did not choose to acquiesce. Either China is oppressing them, or it's an internal problem. https://en.wikipedia.org/wiki/China%E2%80%93North_Korea_border https://en.wikipedia.org/wiki/China%E2%80%93North_Korea_bord...