Per LW:
As with any blockade, one can expect a few blockade running attempts. Ops like this are a time, manpower, and resource drain over the long term.
Might want to sit back and watch it develop...at 15 knots.
What does the blockading country do if a vessel refuses to stop? Do they fire on them, a shot across the bow? They're certainly not going to sink them. Do they place a ship in front of them and dare the runner to ram? That would be a big game of chicken if it were a Chinese vessel.....