New Zealand could defend itslef from a medium-level threat if it had a decent air force combat force such as 34+36 second hand F-16's and several more frigates (total of 4-6). New Zealand is in a very isolated position so therefore they would have plenty of time to prepare for a counter attack. A moderate number of F-16's would do this. In the future if a different political party is in control and decided to change the policy of defending New Zealand against a low-level threat to a medium-level threat then New Zealand may be able to hold its own. The best they could do at the moment is set up a naval blockade and arm the orions with harpoons so they can lay hell on the invaders.