Prime Minister John Key says New Zealand could not follow suit if Australia moves to strip a New Zealand-Australian woman of citizenship to prevent her returning from Syria.
Mr Key was commenting on the case of a woman reported to be trying to negotiate a return from Syria to her hometown of Sydney in return for passing on information to Australia about Isis (Islamic State) terrorist networks.
Australia has taken a hard line on such cases and Prime Minister Tony Abbott is expected to move within days to change the law so dual nationals can be stripped of Australian citizenship if they were involved in terrorism - something he announced he intended to do earlier this year.
Mr Key said if Australia did take that action and stripped the woman of citizenship New Zealand was unlikely to follow suit.