Sailing in Australia’s exclusive economic zone, the three vessels were not breaking international law, but they were unusually far south on an undeclared mission.

Three Chinese warships have been spotted in international waters off the coast of Australia’s largest city, Sydney, in a rare show of military might that will likely test diplomatic ties between Canberra and Beijing.

Australian officials said the ships were “off the east coast of Australia” and their presence there was unusual.

The vessels were sailing in the Tasman Sea, and their announced intent to perform exercises prompted a call for commercial flights to divert course.

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

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

Dozens of commercial flights were forced to change course when Chinese warships unexpectedly announced live-fire drills off eastern Australia last week, officials have told a government hearing. Curran said 49 commercial flights were forced to divert around the live firing zone once it became apparent the warning was legitimate.