Partners without conditionality are becoming vital to Pacific islands
Beneath the Pacific Ocean, thousands of kilometres of fibre-optic cable carry the digital pulse of modern civilisation — and their vulnerability has quietly become the axis around which a new strategic partnership is forming. Australia and Japan, each recalibrating their roles in a region where American attention has grown unreliable, are deepening cooperation through infrastructure investment, defence spending, and diplomatic architecture designed to reassure small island nations that partnership need not come at the cost of sovereignty. The unglamorous work of laying cables and signing bilateral agreements is, in this moment, the most consequential kind of regional leadership.
- Pacific island nations dependent on a single undersea cable face an existential connectivity risk — one deliberate cut could silence banking, government, and communication simultaneously.
- US disengagement is creating a vacuum: a GAO report confirmed Washington failed to properly staff diplomatic missions in Micronesia, the Marshall Islands, and Palau, leaving allies like Palau exposed to mounting Chinese pressure.
- Australia has committed $120 million to PNG cable infrastructure and signed tailored bilateral security agreements with five Pacific nations since 2023, signalling a shift from donor to genuine partner.
- Japan has broken with decades of post-war restraint — lifting lethal weapons export restrictions, crossing a historic $78 billion defence budget, and explicitly naming Pacific islands as a strategic priority.
- Proposed trilateral military exercises in the Torres Strait and more frequent Pacific Islands Leaders Meetings could translate bilateral momentum into a durable, coordinated regional architecture.
When Australia's Deputy Prime Minister Richard Marles addressed Asia's premier defence gathering, he spoke not of warships or missiles but of cables — the fibre-optic arteries buried beneath the ocean floor that carry over 99 percent of international internet traffic. For Pacific island nations relying on a single cable, a cut means everything stops: banking, government, communication. That infrastructure anxiety has become the unexpected foundation of a broader strategic realignment.
Australia's response has been concrete. A $120 million commitment to build three subsea cables in Papua New Guinea is the centrepiece of a wider shift — away from the old donor-recipient dynamic and toward tailored bilateral partnerships. Since 2023, Fiji, Papua New Guinea, Vanuatu, Nauru, and Tuvalu have each signed individual agreements with Canberra shaped to their specific circumstances.
Japan is moving in parallel. Prime Minister Sanae Takaichi visited Canberra in May and named the Pacific islands as a strategic priority — a notable elevation for nations often overshadowed by Taiwan and the South China Sea. Tokyo has lifted its decades-old restrictions on lethal weapons exports, allowing Australia to order Mogami-class frigates from Japanese shipyards. Japan's defence budget has crossed nine trillion yen for the first time; Australia is raising its own from $44.6 billion to $56.2 billion by 2030.
Both nations frame their ambitions through the Free and Open Indo-Pacific — a vision built on freedom, openness, and diversity that offers small island states the theoretical right to remain neutral even as great-power competition intensifies. The timing reflects a real gap: a US Government Accountability Office report found Washington had failed to properly staff diplomatic missions across Micronesia, the Marshall Islands, and Palau, confirming a pattern of Pacific disengagement under the Trump administration. For island nations seeking consistent partners without political strings, Australia and Japan are filling a role Washington is vacating.
What the partnership still needs is architecture. Increasing Pacific Islands Leaders Meeting summits to a biennial cadence, aligning them with Japan's Pacific Island Defence Dialogue, and launching trilateral military exercises in the Torres Strait — with Pacific island regiments included — would transform bilateral goodwill into something more durable. The cables are already being laid. The harder work is building the relationships that make them worth protecting.
Richard Marles stood before Asia's most influential defence gathering and spoke about cables. Not the kind that carry electricity, but the ones buried beneath the ocean floor—the infrastructure that moves nearly every piece of digital information that crosses international borders. He called them the arteries of modern civilisation, and he said the world had been dangerously slow to recognise them as weapons targets.
His concern is grounded in hard numbers. Subsea cables carry more than 99 percent of all international internet traffic. Australia, despite its size and wealth, depends on just fifteen of them. That concentration of dependency creates a single point of failure. For Pacific island nations, the vulnerability is even starker. Many rely on one cable alone. A cut—whether deliberate sabotage or accident—means communication stops. Banking stops. Government stops.
This infrastructure anxiety has become the unexpected cornerstone of a larger strategic shift. In December 2025, Australia committed $120 million to build three subsea cables in Papua New Guinea. The decision signals something beyond engineering. It represents a deliberate recalibration of how Australia engages the Pacific—moving away from the old donor-recipient relationship and toward something closer to genuine partnership. Since 2023, Fiji, Papua New Guinea, Vanuatu, Nauru, and Tuvalu have each signed tailored bilateral agreements with Canberra, each one shaped to that nation's particular needs.
Japan is moving in parallel. Prime Minister Sanae Takaichi visited Canberra in May and explicitly named the Pacific islands as a strategic priority alongside China and Southeast Asia—a notable choice, given how often these island nations get overshadowed by louder flashpoints like Taiwan and the South China Sea. Japan has long been one of the region's largest aid donors. It has supplied heavy engineering equipment to Papua New Guinea and unmanned aerial vehicles to Tonga. In April, Takaichi lifted Japan's decades-old restrictions on lethal weapons exports, a symbolic break with the past. Australia has already seized the opportunity, ordering Mogami-class frigates from Japanese shipyards. Tokyo's defence budget has now crossed nine trillion yen—roughly $78 billion Australian—for the first time in history. Australia is committing to raise its own defence spending from $44.6 billion in 2026 to $56.2 billion by 2030.
Both countries frame this expansion through the lens of the Free and Open Indo-Pacific, a vision originally articulated by Japan's former Prime Minister Shinzō Abe. The concept rests on three pillars: freedom, openness, and diversity. For small island nations wary of being forced to choose sides in a sharpening great-power competition, those principles matter. They preserve the theoretical right to remain neutral, even as neutrality becomes harder to maintain.
The timing is not accidental. A US Government Accountability Office report released this month found that Washington had failed to meet its legal obligations to properly staff diplomatic missions in Micronesia, the Marshall Islands, and Palau. The lapse is symptomatic of a broader pattern: the Trump administration's gradual withdrawal from the Pacific dimension of Indo-Pacific strategy. Palau, a US ally, has grown frustrated by American inattention even as Chinese trade pressure mounts. The calculus for island nations has shifted. Partners who offer consistency without political strings or hidden agendas are becoming essential. Middle powers like Australia and Japan fit that description in ways Washington increasingly does not.
What remains unclear is what this partnership can actually deliver. The architecture for coordination already exists—the Pacific Islands Leaders Meeting brings Japan and eighteen Pacific Forum members together every three years. Increasing that cadence to biennial summits, aligned with Japan's Pacific Island Defence Dialogue and including Australia, would deepen relationships and create more regular opportunities for alignment. A trilateral military exercise involving Australia, Japan, and the United States in the Torres Strait, modelled on existing multinational drills, would sharpen interoperability and send an unambiguous signal that the region has not been abandoned. Including Pacific island regiments in such exercises would underscore the commitment to genuine partnership rather than great-power posturing.
Undersea cables may seem like an unglamorous foundation for strategy. But they are precisely the kind of unglamorous infrastructure that determines whether a nation can function in the modern world. Australia and Japan appear to understand that securing these arteries—and the islands that depend on them—is the real work of regional leadership.
Notable Quotes
The world has been collectively slow to recognise undersea cables as the strategic targets they have become— Australian Defence Minister Richard Marles, at the Shangri-La Dialogue
Japan will play a more proactive role than ever before in supporting an international order based on freedom, openness, and diversity— Japanese Prime Minister Sanae Takaichi, marking the tenth anniversary of the Free and Open Indo-Pacific vision
The Hearth Conversation Another angle on the story
Why does a cable matter so much? It's just infrastructure.
Because it's invisible until it's gone. When a cable cuts, a country loses internet, banking, government communications—everything that depends on digital connection. For a small island nation, that's not an inconvenience. That's a crisis.
But why are Australia and Japan suddenly so focused on this?
Because the United States isn't. Washington has been pulling back from the Pacific, and the islands are noticing. China offers money but with strings attached. Japan and Australia are offering something different—partnership without the political baggage.
Is this about containing China?
It's partly that, but it's also about something simpler. These island nations want to remain independent. They don't want to be forced to choose. Australia and Japan are saying: you don't have to. We'll help you stay connected, stay secure, stay autonomous.
What does Japan lifting its weapons export ban have to do with undersea cables?
It's the same signal sent two different ways. Japan is saying it's willing to break with its post-war constraints because the region's security environment has changed. Australia buying those frigates says the same thing. Both countries are committing real resources, not just rhetoric.
Can they actually pull this off?
They have the money and the will. What's uncertain is whether they can do it fast enough, and whether the United States will stay engaged enough to make it credible. If America completely withdraws, the islands lose their hedge. That's the real risk.