There are several levels to be considered for this and the end result could go on for some time so breafly. We must also consider tha an attack against us is likely to be in conjuction with an attackon Australia, which means they will have their own problems and won't be able to help us.How?
The governments priorities are wack. They choose announcements and delays over prioritising budget announcements.
I have my unprofessional bias. Perhaps you have a professional opinion for how to prioritise so.. how?
To protect against a direct threat to our sovereignty we need to to be able to control the air and sea aproaches to NZ. In this respect we have a 2000km moat, this puts us outside the combat radus of land based strike or fighter type aircraft.
Howeverthe first priority is to know what is happening in our regon, so we need to improve survaliance and inteligance abilities. the next priority is to provide a credable ability to deter or destroy both air or sea based attacks and it is my belief this is best covered by reforming an ACF as this can carry out e defence against either air or sea borne threats at a significant distance fro our shores and it has the ability to carry the apropriate weapons to the apropriate location quickly.
The next priority is to maintain critical comunications like fuel importing in which the navy and airforce have the major imput and additional frigates and P8's are required. in this respect maintaining the Tasman sea communication would be a priority.
Regional defence requires a whole extra layer of abilities which would involve all 3 servicesI and I will leave at this time.