Recent unprecedented live-fire drills by China's navy in the Tasman Sea between Australia and New Zealand were "totally in line with international law", a spokesperson for its defence ministry said on Thursday.

The drills, conducted near a busy air corridor, have prompted both countries to enhance surveillance and collaborate with allies.

The three Chinese navy ships in the Tasman Sea have moved slightly closer to Australia. The ships have been sailing in international waters off Australia's east coast and conducting live firing exercises, causing trans-Tasman flights to divert.

Sky News host Chris Kenny discusses Prime Minister Anthony Albanese’s “meek” apology to China over the warships in the Tasman Sea.

Chinese naval drills in international waters between Australia and New Zealand caused dozens of flight diversions.