NORTH KOREA

On the way in to school this morning I was listening to the NPR report on North Korea. North Korea is going back to the bargaining table. The U.S. and other countries are evidently using energy and other aid packages to keep North Korea from continuing its nuclear development. Evidently western countries are trying to do this with Iran and possibly other states. I haven't read all the details, but I am a bit concerned that the west thinks it can "bribe" countries into doing the right thing. Bribes always seem to have to grow as countries become more adept at manipulating the giver. When does a "payoff" as a reward become blackmail?