The US announced their participation in the TPP in 2009, a free trade agreement encompassing trade between the US and New Zealand. The Obama administration had

The US announced their participation in the TPP in 2009, a free trade agreement encompassing trade between the US and New Zealand. The Obama administration had been very gung-ho about its ratification in the US, so I don't think the question of nuclear powered warships comes up much anymore. I don't think you can squarely point to the New Zealand–China FTA for whichever interpretation of colonization you'd like – immigration laws were mostly unchanged by the FTA with the exception of short term work visas, and property purchases by Chinese investors is not an exclusively "countries who have negotiated free trade agreements with China" phenomenon (see Vancouver in Canada, Seattle in the US).