Australia learned about Chinese live-fire naval drills off the country’s coast that forced dozens of flights to be diverted via an alert from a commercial pilot, authorities said on Monday.

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.

Chinese warships conducting unusual exercises near Tasmania are armed with “extremely capable” long-range ballistic missiles, New Zealand’s defence minister warned.

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.