OT- north korean nuke weapon plutonium - source?

What's the source of the material that the north koreans are using to make
their nukes. Does it come from their own reactors? It's being described in
the press as "reprocessed nuclear fuel rods". Are they getting the stuff
from sources in the west ?
As an aside- interesting that the 2 countries that have troops in Iraq have
suffered electrical grid problems that have affected their 2 primary
cities... Pat