The article from a respectable German newspaper bases its claim on the research of the swedish nuclear physicist Lars-Erik de Geer who found evidence that North Korean nuke tests showed signs of uranium explosion although North Korea probably has no Uranium. The article also cites "intelligence sources" that point to the long-standing cooperation between North Korea and Iran in military matters.
I post this here because the majority says Iran wants nuclear energy for peaceful purposes. If this turns out to be true, we have to rethink that
(visit the link for the full news article)