"Australia is our only ally and closest friend. As in any relationship, we will have our differences. But unquestionably Australia constitutes a vital source of resilience for our economy and is our key partner for New Zealand in the wider world," said Ardern, who will meet with Australian Prime Minister Malcolm Turnbull in Sydney on Friday.
"New Zealand's relationship with the United States is also fundamental," she said. "For over 70 years, the values and interests of New Zealand and the United States have intersected more often than not. The sheer size and dynamism of the world's biggest economy, America's capacity for ideas and the energy of its people give it enormous scope to help shape a better world.
"But the real strength of any important relationship lies in its breadth and ability to encompass difference. For example, we were disappointed at the United States' withdrawal from the Paris agreement and some of its positioning on trade. But our relationship with the US is certainly robust enough to withstand those differences."
Answering questions, Ardern said "the biggest threat" for New Zealand was the erosion of global rules-based institutions.
Rules were important but "if they are flouted, what's the point?"
However, governments had to build "social licence" among its own people to maintain support for those global structures.
On trade, Ardern repeated the government's intention to take a more inclusive and transparent approach to free-trade agreements, defending the decision to go ahead with the upgraded Comprehensive and Progressive Trans-Pacific Partnership.
"We ignore the interaction of global developments on our domestic population at our peril. Overseas experience, and our own, tells us that if we want to retain the values of being outward looking, engaged in global institutions, welcoming of trade and direct investment, we must build the social licence for that.
"The last APEC meeting in Vietnam, for instance, had a strong focus on creating greater inclusiveness around the trade agenda. We want to take that a step further.
"The experience of watching the early interactions of TPP, and being part of the final negotiations taught me a lot. It reaffirmed my belief that trade has the ability to support sustainable, productive and inclusive growth if that is the agenda you enter negotiations with," she said. "That is why you will see us establish a different framework for trade negotiations, one where we more openly pursue the interests of our regions, SMEs, Maori and women."
On wider international issues, Ardern announced the government's intention to ratify the Treaty of the Prohibition of Nuclear Weapons, signed last year, and the reinstatement of the Cabinet portfolio of Minister of Disarmament and Arms Control, which would be held by Foreign Minister Winston Peters.
(BusinessDesk)