It is not a suprise that they are actively pursuing longer and longer range missiles. They held military exercises a few months ago, and as the finale they launched a sounding rocket rather high. Rumor has it that they would have launched their next-generation ballistic missile if it had been ready and certain photographs of the launch ceremony seem to show weird smoke trails from more than one launch site indicating that they had more than one missile ready to go, but of course none of the media present would question what they were told even if they had the expertise to tell the difference between a sounding rocket and a ballistic missile.
The point is that everyone knows that they are developing a number of missiles (everything from anti-ship missiles to ballistic missiles with very long range) and they are firing up enough centrifuges to enrich uranium far beyond the level required for nuclear power plants. You do the math...