Meanwhile, North Korean officials engage in even more bizarre behavior. For example, food and fuel supplies sent to North Korea have been halted, not to force North Korea to stop missile tests or participate in peace talks, but to return the Chinese trains the aid was carried in on. In the last few weeks, the North Koreans have just kept the trains, sending the Chinese crews back across the border. North Korea just ignores Chinese demands that the trains be returned, and insists that the trains are part of the aid program.
It's no secret that North Korean railroad stock is falling apart, after decades of poor maintenance and not much new equipment. Stealing Chinese trains is a typical loony-tune North Korean solution to the problem.
If the North Koreans appear to make no sense, that's because they don't. Put simply, when their unworkable economic policies don't work, the North Koreans just conjure up new, and equally unworkable, plans. The Chinese have tried to talk the North Koreans out of these pointless fantasies, and for their trouble they have their trains stolen.
How do you negotiate under these conditions? No one knows. The South Koreans believe that if they just keep the North Korean leaders from doing anything too destructive (especially to South Korea), eventually the tragicomic house of cards up north will just collapse. Not much of a plan, but so far, no one's come up with anything better.