The Cabinet decision has rather made nonsense of a core selling-point in New Zealand's successful campaign for a seat on the United Nations Security Council - that the country did not belong to any formal alliance, grouping or association with first claim on its allegiance.
New Zealand's campaign was very much based on its role as an honest broker able to advocate for other small states suffering from big power bullying or intransigence without siding with big brother.
For most of his time as prime minister, John Key has enjoyed the best of all worlds, hobnobbing with Barak Obama and David Cameron over lunch while making continuous references to running an independent foreign policy all the way to dinner-time.
Well, it has taken the rise and rise of Isis to remind everyone that there is no free lunch at the White House or in Downing St. Last Tuesday's official announcement of the Iraq decision inevitably resurrected talk of prices and clubs, although Key had sought the day before to downplay the Washington and London connections, watering down the exclusivity of the "club" by saying that when he referred to the club, he had always meant all of the 62 countries in the American-led international coalition contributing to the combating of Isis.
The audacity of Key's last-minute attempt to rewrite what he had said was truly mind-blowing because what he said was quite clear.
He might have been better advised to have taken a leaf out of Act's book by preaching the virtues of collective security. That would have been an honest expression of National's true position on the deployment.
But that would not have fitted with Key's modus operandi to be all things to all men (and women). That requires he perpetuate the notion that he has simply followed Helen Clark's multilateralist approach to foreign policy when he and his ministers have actually focused far more intently on restoring much closer ties with traditional allies, particularly the other Five Eyes members - the United States, Britain, Canada and Australia.
That Key faces difficulty in trying not to upset his domestic audience while satisfying his international one can be seen from the time it took to give the order to send the soldiers who will be in the first group of the two-year mission to train raw recruits and officers in the Iraqi army.
In contrast, Australia's self-prescribed role as Washington's little helper resulted in the rapid dispatch of Australian troops to Iraq late last year, only for them to end up twiddling their thumbs in the United Arab Emirates while the bureaucracy in Baghdad got around to giving them clearance to enter the country.
Apart from suffering delusions of grandeur that they have a self-appointed role as an international policeman, Australians consider their relationship with the United States as absolutely fundamental to their country's defence and wider interests. Where Washington goes, Canberra follows.
While New Zealanders are more than willing to pull their weight internationally, they are far less inclined to sit back and let outsiders determine their international obligations since Anzus fell apart in the 1980s because of Labour's anti-nuclear policy.
This has been most apparent in the context of Iraq. New Zealand contributed air transport and a medical team to the international coalition which reversed Iraq's 1990 invasion of Kuwait.
Helen Clark refused to be party to the George Bush and Tony Blair-instigated invasion of 2003 to oust Saddam Hussein.
Membership of Five Eyes did not appear to be a factor in that decision. But there was a price. Once the invasion was over, Clark agreed to send a team of 60 or so army engineers to Basra in southern Iraq for a year.
Key has likened that deployment to the one announced this week, saying it shows that Labour - despite its refusal to weigh in behind the dispatch of the 16 army instructors and their protectors and logistical personnel - would not have done things any differently had it been in power.
But the Basra deployment was very different. It did not happen until the fighting had ended. It was confined to reconstruction work, and it was covered by Security Council resolutions which provided the legal clearance.
The pending deployment takes New Zealand soldiers into a war zone where they may well become targets for Isis and for disgruntled Iraqis.
The expectation - rightly or wrongly - is that their work will make little appreciable difference to the fighting qualities of the Iraqi army,
While Key took time to soften up New Zealanders to the likelihood of a military deployment, no effort was made to sell the case for training Iraqi troops until Tuesday afternoon's press conference which included a briefing from the Chief of the Defence Force.
It was too little too late. Labour had already won the battle by shifting the argument away from the need to respond to the threat posed by Isis to the pointless nature of that response. Key hit back with his now-famous rejoinder that Andrew Little "get some guts" and back sending the instructors.
But Labour will hang tight. It will support military action it believes is effective - such as air strikes against Isis.
It will urge National to bring forward diplomatic initiatives through New Zealand's chairing of an influential anti-terrorism committee on the Security Council.
But above all, Labour believes this is as good as it gets for Key on Isis. It has a bad feeling about the deployment and sees no reason to align itself with something which could go spectacularly wrong.
If that happens, it will be on Key's head alone.
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