A U.S. Coast Guard cutter crossing the Tasman Sea as part of maritime security cooperation with Australia and New Zealand knew Chinese naval ships were in the area but had no interaction with them, its commanding officer said on Tuesday.

New Zealand Defense Minister Judith Collins said Monday that a Chinese naval group conducting military exercises in the Tasman Sea was armed with "extremely capable."

Explainer - How are the vessels classified, what weapons can they carry and what nuclear capacity do they have?