Working with assertive China a must: Jacinda Ardern

New Zealand has been aware for some time now of a "growing assertiveness" and a "growing interest" in its region - explicitly from China, according to Prime Minister Jacinda Ardern. But Ms Ardern also spoke of the need to work together with China, on areas of "natural mutual interest".

Speaking to the BBC in an exclusive broadcast interview, she stood by what she called her country's "mature relationship" with Beijing, but still expressed her "disappointment" that the Solomon Islands had cemented a security deal with China, fuelling fears Beijing could set up a military base on the island.

There is already an agreement signed by Pacific Island forum members called the "Biketawa" declaration, she said - which sets an expectation these countries provide for their own security needs together as a region.

"One of the reasons we've expressed this disappointment [is]... Australia and New Zealand both have heeded the call of the Solomons for support during recent disruption," she said. "And we've again highlighted that should any extended need exist, we are there to help and support. So… what gap remains that requires such an agreement with China?"

Not time to join Aukus, yet...

Despite her reservations however, Ms Ardern rejected the idea that it was time for New Zealand to join the US, UK, and Australia in the Aukus security alliance to help ward off China's influence in the region.

"Our call on Aukus is simply that yes, it is to our benefit when we have greater engagement," she said. "We've asked the US to take an interest in the economic architecture of our region, it can't just be about defence and security arrangements," she said.

"It should be about the wellbeing of the region as a whole. And you're starting to see a response from the US on that front." New Zealand has been criticised for not taking a harder line on China. Ms Adern's administration's position has been that New Zealand will form its own bilateral relationship with China - which critics say is because of economic dependence.

Most recently the government came under fire for agreeing to extradite Kyung Yup Kim, a New Zealand permanent resident accused of murdering a young woman in Shanghai in 2009. But Ms Ardern defended Wellington's relationship with Beijing.

"China is a very important trading partner for us, but it's also a mature relationship for us. Where there are areas we can work together, we will - but there will always be areas in which we will not necessarily agree and when those areas arise, we are very forthright and clear on our position."