I am a Russian citizen. At the moment I have obtained an Australian tourist visa to cruise. Voyage starts from Sydney and ship will be docking at New Zealand ports as well.
Do I need a New Zealand visa?
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Assuming you will not be there for more than 28 days and will leave with the vessel when it leaves, no need for a visa:
You must have a valid passport
You must have a passport that is valid for three months after the date you intend to leave New Zealand.
Deemed to hold a visa
If you are a passenger or a crew member of a cruise ship in New Zealand you are deemed to hold a visitor or work visa for 28 days from arrival, or until the ship leaves (whichever occurs first).
If you leave the ship and stay on in New Zealand, you must obtain a further visa. You must apply for the visa before the expiry of your deemed visa by completing a passenger arrival card and presenting it to a New Zealand Customs officer.
If you remain in New Zealand and you do not have a current visa you will be here unlawfully, and you may be deported.
Only passengers and crew who arrive on the ship will be deemed to hold a visa. If you fly into New Zealand to join the ship you must apply for a visa in the normal way.
From IMMIGRATION New Zealand.