So we see clash of ideology and now threats/rhetoric. It would be easy to just say idle threats and rhetoric and ignore but the North is said to be developing nuclear weapons testing and now working on missle long range technology that could lead to ICBMs. Sanctions have not worked, so far other than to punish N Korea.
As the N.Koreans develop weapons technology and if sanctions continue to fail and they continue to threaten one might expect they will be attacked before they get too strong. While there is still hope of a peaceful agrement and perhaps unification every test etc brings the country closer to a war situation. Now how this will affect the price of oil is secondary but thinking it could go much higher on any such conflict. One must also be aware of the link between N.Korea and Iran.