[Cheezeninja]

I think it could easily be argued either way, but that's not what really matters; what matters is that you now have control of the province and can justify your actions so you don't appear to be someone whose word cannot be trusted. Of course the other nation can justify attacking you immediately as well (I for one, wouldn't judge him for it) so you should have been prepared for that before taking the province. If you saw it as an opportunity to snag a free province in an underhanded way and then expect to be able to hide behind the all too obscure letter of the law, then you might be in for a world of hurt. There's no small claims court in Dominions.

I would honestly only do what you did from a position of power when I was pretty much looking for an excuse to attack that neighbor anyway.