Right. You can easily fetch $1 million. Chinese customers will be lining up at your doorstep, and the line would be very long.:-)
Which of course points out the problem.
China IS on North Korea's doorstep, and they evidently don't want anything to do with arbitrage of this stuff. Probably because of NK's notorious pillaging of rolling stock.
It sucks being a notorious trade risk. The Norks are discovering that.