An unusual series of military exercises by Chinese warships in the sea between Australia and New Zealand has prompted reproval from leaders in both countries about the amount of warning given.

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.

New Zealand raised fresh concerns Monday over nearby live-fire drills conducted by Chinese warships armed with “extremely capable” weapons, an unprecedented show of firepower last week that analysts say are part of Beijing’s ongoing plan to build a blue-water navy with global reach.