Those heroic, principled Kiwi lefties:

‘The former Labour government was seeking to curb American and Australian influence in the Pacific by courting China and France, United States embassy officials believed.
The explosive claim is contained in a secret cable from the United States embassy in Wellington to senior Bush administration officials titled: “What we could not say in the mission programme plan”, and obtained by Fairfax Australia journalist Philip Dorling from WikiLeaks.
In the same cable, it is claimed that New Zealand’s anti-nuclear legislation was driven as much by a desire to cut costs as ideology.
“We have been told by retired [government of New Zealand] officials who were in senior positions in the Lange government at the time the anti-nuclear policy was instituted that one of the considerations favouring the policy was that it would lead to New Zealand withdrawing or being pushed out of Anzus, thereby lessening the country’s defence spending requirements at a time of fiscal and economic crisis.”
source