New Zealand's spy service warned Thursday that China is the most active power engaging in foreign interference in the country, including through front organisations.

New Zealand faces the "most challenging national security environment of recent times", the country's intelligence agency said in an annual risk assessment.

Key drivers of the deteriorating threat environment were less stable relationships between states, deepening polarisation and growing grievances.

Though several states seek to manipulate New Zealand's government and society, China remains the "most active", the New Zealand Security Intelligence Service said.

The spy agency specifically accused China's United Front Work Department of engaging in foreign interference to build influence outside of China.

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