The sanction regime is full of holes and everyone knows it.  There are too many parties in the region, including companies and governments throughout Asia that have an interest in doing business in Asia, its not just China.  Thinking that sanctions will bring NK to their knees is laughable.  I mean a big source of hard currency are remittances from North Koreans working abroad, The new sanctions limit the use of NK labor, but it caps them at "current" levels.   There is no reduction in the number of laborers and to make it worse each UN member state gets to say how many NK laborers it has (how much you wanna bet they will juice up their numbers).  Further as far as trade goes some countries like China, Myanmar and Thailand do not regulate trade by non-state actors.  This is why the present sanctions don't work.  Nothing has really changed.  The rest of Asia with the exception of Japan and South Korea are not overly concerned about NK Sanctions