Australia criticized China on Saturday for not providing adequate justification for what it deemed insufficient notice regarding a live-fire drill conducted in waters between Australia and New Zealand, which led to flight diversions by airlines.

Defence Minister Richard Marles stated that the government has yet to receive a “satisfactory answer from China regarding the notice” of the drills, which he described as “disconcerting” for commercial aviation.

“When we conduct such activities, we typically provide 12 to 24 hours of notice,” Marles explained to Nine Entertainment, as per a transcript. “A satisfactory explanation is needed as to why that was not possible.”

On Friday, airlines such as Qantas, Emirates, and Air New Zealand adjusted their flight routes between Australia and New Zealand after China announced that its navy would conduct live-fire exercises in international waters off the coast of New South Wales.

Australia’s defence force indicated that there was no immediate threat to Australian or New Zealand assets, as confirmed by the government on Friday.

“China did adhere to international law, and it is crucial to acknowledge that,” Prime Minister Anthony Albanese remarked on Saturday during a broadcast by the Australian Broadcasting Corporation.

Chinese foreign ministry spokesman Guo Jiakun stated on Friday that the naval exercises “maintained safety standards and professional operations in accordance with relevant international laws and practices.”

Australian Foreign Minister Penny Wong met with her Chinese counterpart Wang Yi on Friday during a Group of 20 meeting in South Africa, where they planned to discuss “safe and professional military conduct.”

The exercise occurred following the entry of a People’s Liberation Army Navy frigate, cruiser, and replenishment vessel into Australia’s maritime approaches last week, which subsequently traveled down the east coast of Australia this week, under the observation of the navies and air forces of both Australia and New Zealand.

Earlier this month, Australia raised concerns regarding “unsafe and unprofessional” maneuvers by a Chinese fighter jet directed at an Australian maritime patrol in the South China Sea. In response, Beijing accused the Australian aircraft of “deliberately intruding” into its airspace.

China continues to reject the 2016 ruling by the Permanent Court of Arbitration in The Hague, which determined that its extensive claims over nearly the entire South China Sea—areas also claimed by several Southeast Asian nations—lack support from international law.