They may still run if accepting the paid vacation offer would be followed by imprisonment at home.
So offer them permanent residency instead. And then prepare for the logistics issue of managing a great fleet of boats racing straight to your ports.
"Dealing" with China is going to get a lot hotter. Period.
Want to get rid of the fishing fleet? Make a credible offer of residency and amnesty to all their crews - no strings attached, no continued use as pawns in politics. Simple trade: they bring in and surrender their vessel, you give each a green card, a key to a room, some starting cash, and a "thank you for your service", and forget about them.
But OK, so let's scratch the "and forget about them" part. Have the counterintelligence agency keep their details in their database, and warn them that they won't get security clearance in the next decade or three. This won't discourage anyone who's eager to escape their home country.
Or start using a bunch of them to sink for reef seeding.