Friday, 17th April marked a historic step in Australia–Papua New Guinea relations, with PNG completing its internal processes to bring the PNG–Australia Mutual Defence Treaty known as the Pukpuk Treaty into force.

The agreement builds on decades of shared history, close cooperation and mutual trust, further strengthening the long-standing security partnership between the two nations. It reflects a joint commitment to support each other and protect national sovereignty.

Australia’s High Commissioner to Papua New Guinea and Special Envoy for Pacific Affairs, Mr. Ewen McDonald, who witnessed the signing, described it as a significant milestone.

He said the signing by Foreign Minister Justin Tkatchenko marked an important step forward in an already strong and enduring partnership, highlighting both countries’ shared vision for a peaceful, stable and prosperous region.

Australia and Papua New Guinea have long worked together on defence and security. The treaty now provides a clearer framework to deepen cooperation, improve coordination between their defence forces, and respond collectively to emerging regional challenges.

The Pukpuk Treaty also formally establishes Papua New Guinea as Australia’s newest ally, the first in more than 70 years reinforcing both nations’ commitment to peace, stability and security across the Pacific.