The federal government is considering how to evacuate the 200,000 Australians in north Asia should tensions with North Korea escalate into war.
Australians on holidays or working in Asia have been told to monitor the crisis closely.
The government has updated its travel advice for South Korea and Japan in response to North Korea's nuclear and ballistic missile tests.
The advice says further provocations by Pyongyang or reactions by other countries cannot be ruled out, and tensions could escalate with little warning.
Speaking to Channel 9, Prime Minister Malcolm Turnbull urged all Australians overseas, but especially those in or heading to China, Japan or South Korea, to register with the government's Smart Traveller website.
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