Why is New Zealand alarmed about the Cook Islands' deal with China?

New Zealand has expressed alarm over the Cook Islands' strategic agreement with China due to a lack of consultation before the signing. Despite having constitutional ties to the self-governing Pacific nation and providing ongoing budgetary and defense support, Wellington was not informed about this important diplomatic development. This situation has created tension between New Zealand and the Cook Islands, as their relationship is based on constitutional connections that typically would warrant transparency and discussion on major international agreements, especially ones that could impact regional security dynamics.