The only RL modern naval blockade I know of is the USCuban Missile Crisis.
Since NK is a 2nd rate navy it would probably only take destroyer patrols to effectively blockade shipping. The issue would come from 1) the political will to fire when a ship actually attempts to run the blockade (ie Cuban Missile Crisis) or 2) the response to when a bigger defender, aka China, decides to intervene.
You could start the scenario with sub ISR for WMD survillence. Mission 2 will be mine sweeping and threat assessment. Mission 3 will be fog of war and friend or foe identification coupled with 'respond to the blockade runners'. Mission 4 can be response to an openly hostile Chinese response.
LB
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