A 21-year-old has been arrested on the suspicion of leaking classified US documents; possibly compromising intel and relationships with allies.

Massachusetts Air National Guard, Jack Teixeira is suspected of posting the data on a gun enthusiast site.

Waikato Law Professor Al Gillespie told Jack Tame that leaking information about special forces could affect the war between Russia and Ukraine. 

He says the good news is that New Zealand didn't have Special Forces there at the time.

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• Pentagon leak: Suspect taken into custody