Insecurity is what drives an arms race. Reassurance is essential.
At the Shangri-La Dialogue in Singapore, Australian Defence Minister Richard Marles placed before the assembled world a warning that belongs to the oldest grammar of geopolitics: that unchecked military expansion, absent transparency or reassurance, does not project strength so much as manufacture fear — and fear, reliably, arms itself. China's buildup, the largest since the Second World War, is not merely a bilateral concern but a regional condition, one that may compel neighbours into a spiral of rearmament that serves no one's long-term interest. Marles offered not accusation but arithmetic: insecurity, left unaddressed, has its own inexorable logic.
- China's military expansion — the largest any nation has undertaken since 1945 — is reshaping the strategic calculations of every government bordering the Indo-Pacific.
- Australia's new defence minister used a major regional security forum to name the risk plainly: without Chinese transparency and reassurance, a cascading arms race is not a possibility but a near-certainty.
- The South China Sea sits at the centre of the tension, where Beijing's militarisation is being characterised not as modernisation but as the use of force to delegitimise neighbouring territorial claims.
- Australia is responding with its own commitments — 2% GDP defence spending, long-range strike weapons, quantum and hypersonic capabilities, and the AUKUS partnership — while simultaneously reaching toward Japan and India to broaden its regional alliances.
- The path out, Marles suggested, still exists: if China chooses transparency and rules-based engagement, the spiral can be interrupted — but that choice belongs to Beijing, not Canberra.
Richard Marles arrived at the Shangri-La Dialogue in Singapore with a message that was less a diplomatic overture than a structural observation: China's military expansion, the most ambitious undertaken by any nation since the Second World War, is generating a logic of its own — one that, if left unaddressed, will pull the entire Indo-Pacific into an arms race no country has chosen but few will be able to avoid.
The minister was careful to frame this not as accusation but as physics. Insecurity drives rearmament. When a neighbour's military buildup reaches a certain scale without accompanying transparency or reassurance, other nations have no rational choice but to assume the worst and respond accordingly. Australia, he said, does not dispute any country's right to modernise its forces. But modernisation at this scale demands explanation — and without it, the cascade becomes inevitable.
On the South China Sea, Marles was unusually direct: China's militarisation there represents an attempt to deny neighbouring claims through force, in violation of the UN Convention on the Law of the Sea. This was not the softened language of summitry. It was a plain statement of what Beijing's actions mean in practice.
Yet the speech also held space for complexity. China remains Australia's largest trading partner, and Marles acknowledged that a cooperative path remains open — if Beijing chooses to engage with the rules and norms that allow disputes to be settled through dialogue rather than military pressure.
Australia, for its part, is not waiting. The Albanese government will maintain defence spending at 2% of GDP, investing in long-range strike, hypersonic, quantum, and undersea capabilities under the framework of the AUKUS partnership with the United States and Britain. Marles announced plans to travel to Japan and India, signalling an intent to weave a broader web of regional defence relationships.
The 70-year US alliance, he said, has never mattered more — but American commitment alone cannot resolve what is ultimately a question of Chinese choice. Beijing can offer transparency and restraint, or it can continue on its current trajectory, knowing that each step will prompt responses from neighbours who see no other way to protect themselves. Marles was not issuing a threat. He was describing, with quiet precision, how arms races begin.
Richard Marles stood at the Shangri-La Dialogue in Singapore on Saturday morning and laid out a calculation that has begun to preoccupy defence planners across the Pacific. China's military expansion, he said, is the largest and most ambitious any country has undertaken since the Second World War ended. That fact alone would be notable. What made his speech urgent was what he said would follow if nothing changed: a cascading arms race across the region as neighbouring nations, watching Beijing's buildup with growing alarm, felt compelled to arm themselves in response.
Marles did not frame this as an accusation so much as a warning about physics. Insecurity, he explained, is what drives an arms race. Without reassurance—without transparency about military intentions and a statecraft that genuinely seeks to calm rather than intimidate—countries have no choice but to assume the worst and act accordingly. Australia, he said, does not question any nation's right to modernise its military. But when that modernisation reaches the scale China has undertaken, the neighbours watching it happen need to understand it as something other than a threat. Otherwise, the logic becomes inevitable: they will build up their own capabilities in response.
The minister's remarks were pointed about the South China Sea in particular. China's militarisation there, he said, should be understood plainly: it is an attempt to deny the legitimacy of neighbouring claims to that vital waterway through the application of force. The UN Convention on the Law of the Sea should apply everywhere, including there. This was not diplomatic language. It was a direct statement about what China's actions mean.
Yet Marles also acknowledged the complexity of Australia's position. China remains the country's largest trading partner. As it grows, Marles said, it should respect the agreed rules and norms that allow disputes to be resolved through dialogue and international law. The implication was clear: there is still a path forward if Beijing chooses it. The alternative—a region locked in a spiral of military competition, each nation responding to the last—serves no one's interests.
The speech was also a statement about Australia's own commitments. The new Albanese government, Marles said, will not cut defence spending. Australia is committed to spending 2 per cent of GDP on defence, including on long-range and precision-strike weapons, quantum technology, artificial intelligence, undersea warfare, and hypersonic capabilities—all outlined in the 2020 strategic defence update. The AUKUS agreement with the United States and Britain will guide the accelerated development and deployment of these systems where they have the most impact. And Australia's ambitions extend beyond that partnership: Marles said he would travel to Japan on Monday and to India soon, signalling that the country intends to deepen defence ties across the region.
The 70-year alliance with the United States, Marles said, has never been more important. Deep American engagement in the Indo-Pacific has never mattered more to regional stability and prosperity. But the underlying message of his speech was that American commitment alone cannot solve what is fundamentally a problem of Chinese choice. Beijing can choose transparency and reassurance. Or it can continue on its current path, knowing that each step will trigger responses from neighbours who have no other way to protect themselves. Marles was not threatening escalation. He was describing what happens when one power's military buildup creates an imbalance so large that others feel they have no alternative but to respond.
Citas Notables
China's military buildup is now the largest and most ambitious we have seen by any country since the end of the second world war. So it is critical that China's neighbours do not see this buildup as a risk to them.— Defence Minister Richard Marles, Shangri-La Dialogue, Singapore
Without reassurance, it is inevitable that countries will seek to upgrade their own military capabilities in response.— Richard Marles
La Conversación del Hearth Otra perspectiva de la historia
Why does Marles keep saying China has a right to modernise its military if he's so worried about what it's doing?
Because he's trying to avoid giving Beijing an excuse to dismiss him as hostile. If he said China shouldn't arm itself, he'd be easy to dismiss. Instead he's saying: arm yourselves if you want, but do it in a way that doesn't terrify your neighbours. The problem isn't the buildup itself. It's the silence around it, the opacity, the way it looks like preparation for something.
But if China's military is already the largest since World War Two, isn't it too late for reassurance?
That's the real question underneath everything he said. He's warning that if China doesn't start being transparent now, the region will lock into an arms race that nobody wanted. It's a last-chance argument, not a confident one.
Why does he keep mentioning Russia and Ukraine?
Because it's the cautionary tale. Russia built up its military, created an imbalance, and then decided the benefits of using it outweighed the risks. It was catastrophically wrong. But the point is: economic ties didn't stop it. Trade didn't prevent war. That's what keeps defence planners awake at night about China.
So Australia is just going to spend more on defence and hope China notices?
Australia is signalling that it will match whatever China does, but it's also saying: there's still a choice here. We're not locked in yet. But if you keep building without talking, we will have to respond. And so will Japan, India, everyone else. That's the arms race he's warning about.
Is he optimistic that China will listen?
The speech doesn't sound optimistic. It sounds like someone laying out what will happen if things don't change, while hoping they do.