Foreign Minister Marise Payne says a planned second meeting between US President Donald Trump and North Korea's Kim Jong-un is an "important next step" in building peace.
President Trump announced the February 27-28 meeting in Vietnam during the State of the Union address on Wednesday.
Senator Payne said it was important for the two leaders to further discuss sanctions and denuclearisation.
"It is not an overnight process, it is a very significant process and it will require effective negotiation with the regime," she told ABC TV on Wednesday.
"That (second meeting) is an important next step and I look forward to continuing to work with like-minded allies and partners on ensuring that what we are able to achieve is that complete, verifiable irreversible denuclearisation of the Korean peninsula."
Senator Payne expected Australia would be given an opportunity to express its views on the agenda.
On the issue of the US reducing troop numbers in Afghanistan, also raised in the president's speech, she said she had spoken with US officials about the move.
The proposal was "still being worked through" within the US government and military, she said.
Mr Trump offered no specifics on when 14,000 US troops would come home.
