“We are very concerned about the issue,” Mr Wen told reporters after meeting with Australian Prime Minister John Howard.
“We are following closely the information showing that there might be a possible launch of a missile by DPRK (Democratic People’s Republic of Korea).
“We hope the various parties will proceed from the greater interest and stability on the (Korean) peninsula and refrain from taking measures that might worsen the situation.”
Mr Wen and Mr Howard, who is in China for a three-day trip that is primarily focused on trade, discussed the nuclear issues surrounding both North Korea and Iran.
“Neither issue is easy to resolve,” Mr Howard told journalists.
“All participants must refrain from any provocative behavior which will deepen the levels of mistrust.”
Earlier, Australian Defence Minister Brendan Nelson entered the fray, saying his country is prepared to support “every reasonable diplomatic and other effort” to ensure that North Korea does not launch a long-range ballistic missile.
Mr Nelson, speaking at the American Enterprise Institute in Washington, said the US and other countries “have every reason to be concerned” about the possibility that such a missile might be fired.
The issue came up during Mr Nelson’s discussions with Vice President Dick Cheney and Defence Secretary Donald Rumsfeld.
The Taepodong-2 missile is thought to be capable of carrying a warhead as far as Alaska.
Mr Nelson came to Washington from Fort Worth, Texas, where the multinational joint strike fighter is being assembled with parts from Australian subcontractors.
Australia plans to buy up to 100 of the planes at a cost of about A$20.54 billion, to replace its fleet of F-111s and F/A-18 Hornets.
Australia also is a member of the US-led force in Iraq, with 460 troops, among the largest non-US contingents.
Unlike many other coalition members, Australia has not set a troop withdrawal date.
In an era of “fundamentalist intolerance,” Mr Nelson said, “we are going to need one another.” He added that US-Australian relations never have been better.