[ewing]

That was my guess, possibly transport by boat off the coast?

But the radar would still pick up a low flying ordinace right..

[longshadow]

But the radar would still pick up a low flying ordinace right..

Well, you could avoid ground-based radar by sneaking up inside a fjord, and launching it below the ridge altitude.

But rocket engine plumes are detected by IR signature by satellites.

Perhaps the N. Koreans have a giant secret Sling-shot on a board a one of their ships........