Australia will be expected to contribute to a new $US1.5 billion Pacific Resilience Facility to help island nations adapt to the impacts of rising sea levels and more frequent natural disasters, after acknowledging climate change as the region’s biggest security threat.

The final communique agreed by Pacific Islands Forum nations in Nauru last night called on all countries to implement their promised Paris agreement carbon emissions cuts.

The communique, endorsed by Australia and the 17 other PIF nations,...