Australia and Papua New Guinea will not sign a long-awaited mutual defence treaty as expected on Wednesday, the two countries said.

The deal was set to see the two nations commit to defending each other from armed attacks as they face "emerging threats" to their security, according to a copy seen by AFP.

It was expected to be signed by leaders Anthony Albanese and James Marape on Wednesday in Port Moresby.

But the two sides instead said the signing would take place "following Cabinet processes in both countries".

The joint communique did not detail the reason for the delay, although Albanese previously said the approval by the Papua New Guinean cabinet due Monday had been delayed by the country's independence celebrations.

The two sides agreed to "strengthening and expanding defence c

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