Pah, enugh of this nonsense I say. Why don't we all call of this treaty if the spanish don't want it, given their stance, they'd rather fight, get annihalated and reduced to a single port before they finally realise they were being let off the hook by this treaty.
The Dutch blockading Spanish ports, whether or not to support the US is, albeit not to the spirit, is in the letter of the agreement. And whether their actions are to support the US or not is not even certain. Either way, they're not breaking the agreement.
Either way, the spanish lot are not in a very good position right now, they have no real allies bar the Pirates maybe, no one likes them and they have the reputation of being untrustworthy turncoats and arrogant to boot. It would do the spanish a lot of good to just accept the treaty, stop complaining and try to get on good terms with any other nation and fix at least some of the damage done.