Australia and Papua New Guinea will upgrade security ties when Prime Minister Anthony Albanese visits Port Moresby to celebrate the nation's 50th anniversary of independence.

Citizens of the neighbouring Pacific nation will be able to serve in Australia's military under the upgraded defence pact though the federal government remains tight-lipped on other speculated details.

Defence Minister Richard Marles would not confirm reports both parties would be required to consult one another if facing a security threat, akin to the requirements spelled out in NATO's Article Four clause.

"The prime minister will be signing this in the next few days, and so I'm going to let the prime minister make those announcements," he told ABC's Insiders on Sunday.

Mr Marles did indicate PNG recruits to the

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