James Marape and Anthony Albanese will sign off on the enhanced defence pact this week. Photo: Mick Tsikas/AAP PHOTOS

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.

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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 c

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