We will seize this ship...to send Kim a message.
We can just hope that little Kim is NOT (1)counting on our knowledge of that ship's history to (2)attract us to intercept it when (3)he intentionally has nothing banned in it this time and (4)just wants to create the incident to (a)"prove" his innocent intentions and (b)make future interceptions suspicious and possibly putting us under pressure from our "allies", the Chinese.
Let's do it. Take that ship, unload it, and then trade it for the USS Pueblo.
Certainly we'll board it...or sink it if they refuse. If it's clean it'll be on it's way. If there's banned hardware we just MIGHT capture the crew and sink the ship. The crew can be turned over to the Chinese or South Koreans for repatriation.