But the measure specifically excludes military force. How does one stop a ship at sea without the threat, at least, of military force. Do you say "stop" and if that doesn't work escalate to "Pretty Please Stop."
The "excludes military force" is in reference to the action which can be taken if NK does not comply with the resolution, but if they put up a struggle or have an armed escort tagging along then you don't need specific wording to tell you how to respond in self defense.
I'm sure the Navy already has ROE for such operations.