The postponement of the meeting comes after Canberra pulled out of a $37bn defence deal with France.
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The picture-postcard capital is beloved by tourists but plagued by problems beneath the façade.

The picture-postcard capital is beloved by tourists but plagued by problems beneath the façade.
Eighty women and girls were videoed by secret cameras at a festival, but a judge dismissed the case.
Irmgard Furchner - accused of complicity in more than 11,000 murders - tried to flee on Thursday.
The man took his life before he could be questioned about the case and provide a DNA sample.
The former French president is found guilty of illegally funding his unsuccessful 2012 re-election.
A Turkish man joined a search party without realising he was the person they were looking for.
After the jeers of Greta Thunberg, minsters meet in Italy for the last UN talks before a major climate summit.

The picture-postcard capital is beloved by tourists but plagued by problems beneath the façade.
Eighty women and girls were videoed by secret cameras at a festival, but a judge dismissed the case.
Irmgard Furchner - accused of complicity in more than 11,000 murders - tried to flee on Thursday.
The man took his life before he could be questioned about the case and provide a DNA sample.
The former French president is found guilty of illegally funding his unsuccessful 2012 re-election.
A Turkish man joined a search party without realising he was the person they were looking for.
After the jeers of Greta Thunberg, minsters meet in Italy for the last UN talks before a major climate summit.
Eighty women and girls were videoed by secret cameras at a festival, but a judge dismissed the case.
Irmgard Furchner - accused of complicity in more than 11,000 murders - tried to flee on Thursday.
The man took his life before he could be questioned about the case and provide a DNA sample.
By Guy Hedgecoe
Madrid
Piles of rubbish are one of the problems facing Rome as its residents vote for a new mayor this weekend
Firefighter Craig Hope says Wales needs to adapt to the challenges of warmer weather.
Activists say rage over the 'wolf pack' case has ignited a feminist revolution. But there's also been a backlash.
The protocol was negotiated less than two years ago, the EU's former chief Brexit negotiator says.
By The Visual Journalism Team
BBC News
By Sarah Rainsford
BBC Moscow correspondent
By George Bowden
BBC News