Anthony Albanese is in PNG for the nation's 50th anniversary celebrations. Photo: Mick Tsikas/AAP PHOTOS

A new Australian defence pact elevates Papua New Guinea to the treaty level of the United States and New Zealand, Anthony Albanese says.

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The prime minister is visiting Port Moresby this week to sign the pact with counterpart James Marape and attend PNG's celebrations for its 50th anniversary of independence.

The landmark agreement will "integrate" forces either side of the Torres Strait and could trigger mutual support in cases of conflict.

It will also enable PNG nationals to

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