The key reason why the six-party talks have not made substantial progress is that the United States remains unchanged in its hostile policy toward the DPRK, blocking the settlement of the nuclear issue.  -   Rodong Sinmun     Quotes
The key reason why the six-party talks have not made substantial progress is that the United States remains unchanged in its hostile policy toward the DPRK, blocking the settlement of the nuclear issue. Rodong Sinmun