Suspicions that New Zealand has been involved in spying on foreign governments are growing as Australia is dragged into the international scandal.
Germany's Der Spiegel magazine has reported details of Australia's alleged involvement, based on documents leaked by American whistleblower Edward Snowden.
Australian embassies in Jakarta, Bangkok, Hanoi and Beijing are alleged to have helped the US National Security Agency (NSA) carry out surveillance on host countries.
Diplomats were in many cases unaware of what was going on, Fairfax Media has reported.
New Zealand is a partner in the spy network known as Five Eyes, working with the US, Britain, Australia and Canada.
New Zealand's Government Communications Security Bureau does the alleged spying, and Prime Minister John Key has refused to confirm or deny its involvement.
Green Party co-leader Russel Norman warned on Thursday that New Zealand's allies outside Five Eyes were sure to have concerns.
He said he was sure that if the NSA had wanted to use New Zealand embassies, they would have complied.
Dr Norman said that continuing to be a member of Five Eyes is a diplomatic liability, and should be ended.
Intelligence analyst Paul Buchanan said it would be "farcical" to assume New Zealand didn't contribute to the NSA's surveillance.
"We simply cannot discount the possibility that as a member of Five Eyes, with all of the responsibilities and rights incumbent in that arrangement, that New Zealand embassies in certain strategic quarters of the world would not fulfil the same functions as the US embassies, the Canadian embassies, the UK embassies and high commissions and the Australians," he told the New Zealand Herald.
"To me, it would be farcical to think one of the five is somehow innocent and wonderful and doesn't engage in such things while the other four do."
Key refuses to discuss the GCSB's activities, saying no New Zealand prime minister ever has.
Labour's deputy leader, Grant Robertson, said it was time for that to change.
Like Buchanan, he finds it difficult to believe New Zealand hasn't been involved in spying on Asian neighbours.