Turnbull says: "The United States knows as we know and as Donald Trump reaffirmed. that America stands by its allies including Australia of course and we stand with the United States". "And I can tell you there are no good military options against North Korea".
Speaking at his Bedminister, New Jersey golf resort, he promised the territory would be "very safe, believe me".
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President Xi called on "relevant parties" to exercise restraint and avoid words and actions that would exacerbate tension, state TV reported, adding that it was in the interests of both China and the U.S. to pursue the denuclearisation of the Korean peninsula.
"U.S. Secretary of State Rex Tillerson called for the peaceful denuclearization of North Korea - a common goal of the global community - and stressed the importance of strengthening pressure on North Korea in diplomatic, economic terms", the South Korean spokesman said.
There is concern among Seoul residents that President Trump's confrontational personality might spark a conflict with North Korea that would quickly drag South Korea into the fighting.
The US president's Twitter missive ratcheted up his already bellicose rhetoric with Kim over North Korea's weapons program, as Beijing appealed to the two leaders to dampen their fiery exchange.
On Tuesday, he said the USA would answer any North Korean aggression with "fire and fury".
The paper adds if North Korea "launches missiles that threaten USA soil first and the US retaliates, China will stay neutral".
According to state media in China, Xi said: "At present, the relevant parties must maintain restraint and avoid words and deeds that would exacerbate the tension on the Korean peninsula".
If the Democratic People's Republic of Korea (DPRK) fires missiles toward Guam, they would take about 14 minutes to reach the island and the alert system there would notified the public, Guam's Homeland Security Office said Thursday.
As North Korea's only real ally, China has more influence than any other nation over the hermit nation.