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

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."

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.

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

The Australian and New Zealand militaries are monitoring three Chinese warships that are moving unusually far south along Australia’s east coast on an unknown mission.

New Zealand said the Chinese navy conducted a live-fire exercise in international waters near the Pacific nation on Saturday, a day after it held a similar drill between Australia and New Zealand that forced airlines to divert flights.

China didn’t violate any rules with its live-fire naval exercises. So, why are Australia and New Zealand so worried?

China defence ministry spokesperson Wu Qian said on Sunday that Australian complaints over recent Chinese live-fire naval drills in international waters between Australia and New Zealand were "hyped up" and "inconsistent with the facts".