The Russian invasion of Ukraine has exposed something — an unseen secret about modern warfare: the most powerful armies in the world are running out of ammunition. Not because they misuse ammunition, but because the global economy was never designed to sustain this kind of conflict.

This is the hidden constraint of 21st century warfare. Weapons have become so technologically sophisticated that they are extraordinarily difficult to replace. A Challenger 2Challenger 2Britain's main battle tank — one of the most heavily protected in the world. tank is not a piece of industrial machinery that can be stamped out of metal sheets on a production line. It is a tool of precision that requires rounds made from depleted uranium, thermal imaging, composite reactive armour, and networks of supply chains that span across dozens of specialist manufacturers.

The same complexity is found in air and at sea. Modern missile systems used by both navies and air forces can strike targets hundreds of kilometres away with pinpoint accuracy, but each launch costs tens of thousands of pounds and takes months to replace. Furthermore, sustained use of them requires years of massive stockpiles — for instance, Iran has been saving for up to 20. Each launch represents a significant financial decision, not just a military one.

This is where economics enters the warzone. The side that wins a modern conflict is not the side with the best weapons — it's the side with the deepest industrial capacity to sustain them. This is, fundamentally, an economic issue.

During World War II, this wasn't a problem. Soviet factories were quite literally relocated far away and converted to tank production overnight, chucking out T-34sT-34sSoviet medium tank, produced in enormous quantities during WWII. Roughly 84,000 were built — more than any other tank in history. A symbol of industrial-scale warfare. faster than they could be destroyed. Today, that elastic industry is gone. Modern specialised robotics and complex logistics have an increasingly inelastic PESinelastic PESPrice Elasticity of Supply — a measure of how quickly production can respond to demand. Specialised weapons components score very low: they cannot be scaled up and switched on in a matter of moments when a crisis begins. — they cannot be scaled up and switched on in a matter of moments when a crisis begins.

Drones are the first real answer to this constraint. Cheap, easy to produce, and lethal — they offer commanders strategic effectiveness without the financial burden of a manned aircraft or missile, especially when recruitment for the armed forces is becoming more scarce by the day. In that sense, the rise of the drone is not just a military idea, but an economic one.

As world economies develop, we see not only how economic powerhouses like the USA can manufacture weapons, but also how they can use their economic strength to coerce other countries without firing a shot. Since Donald Trump took office for the second time in 2025, he has proceeded to impose heavy tariffs on many countries, most heavily on China at 145%. His aim was to reduce the US-China trade deficittrade deficitWhen a country imports more than it exports. The US ran a persistent trade deficit with China, importing far more Chinese goods than it sold in return — a key grievance behind Trump's tariff policy., and strategically decouple the American economy from Chinese manufacturers.

On paper, Trump's strategy initially worked. US imports from China fell sharply by 28% — the decoupling was happening. But soon, China simply redirected its exports to alternative markets in Vietnam, Mexico, Southeast Asia, and Europe, flooding them with cheaper goods.

The result was the opposite of what Trump intended: China ended 2025 with a trillion-dollar trade surplus — the largest ever recorded — while America's reputation as a partner became chaotic and unpredictable in the views of its allies. Furthermore, US manufacturing did not elevate, as goods were just sourced out from nearby countries instead.

China, the sleeping giant it was, would not sit idle — and the retaliation was fierce. In a harsh countermove, Beijing imposed 125% retaliatory tariffs on American goods, with the real uppercut being a restriction on the exports of rare earth mineralsrare earth mineralsA group of 17 metallic elements critical to semiconductors, electric vehicles, and defence technology. China controls 90% of global refining capacity — giving it enormous strategic leverage over any nation that depends on modern technology.. These materials, of which China controls 90% of our global refining capacity, are essential for producing semiconductors, electric vehicles, and defence technology. The US automobile industry was thrown into total disarray on two occasions as manufacturers found themselves unable to source components elsewhere.

Trump's era of gunboat capitalismgunboat capitalismUsing economic coercion — tariffs, sanctions, trade restrictions — as a tool of foreign policy. The modern equivalent of 19th-century gunboat diplomacy, where military force was used to open markets. is restricting trade — the fundamental principle of western economic theory. Trump has the potential to do catastrophic damage to both the world economy and his own, but with the supreme court ruling his tariffs illegal, will Trump back off? Or will he continue to disregard others and push on with his theory, wreaking more havoc?

Most countries lack the economic fortitude of China and the US. Smaller, more trade-dependent economies — particularly in south-east Asia and the Global South — found themselves caught in the crossfire. Local manufacturers have been unable to compete with cheap Chinese goods flooding their markets, all while simultaneously dodging US tariff threats of their own.

Unlike China, they had no trillion-dollar surplus to cushion the blow, no rare earth minerals to weaponise in retaliation, and no diplomatic leverage to find alternative solutions.