NAP Breach?

[sector24]

If player B can take the neutral province and it is financially advantageous to do so, he should. If he's nice, he'll collect income for a turn or two but won't build PD. Player A can take it back whenever he wants.

If player B is slightly less nice, he'll crank up the tax rate to 200% while waiting for player A to take it back.

If he decides to keep it, he shouldn't be surprised if player A considers it a hostile act. I think Shakespeare said it best:

"Do you bite your thumb at us, sir?"

"No, sir, I do not bite my thumb at you, sir; but I bite my thumb, sir."