The expanding conflict involving Iran, Israel and the United States has already demonstrated a harsh reality about modern warfare: the most immediate battlefield is often the global economy. Within days of military strikes and retaliatory threats across West Asia, energy markets convulsed. Oil prices surged towards $120 a barrel before abruptly retreating below $90 after remarks by US President Donald Trump hinted that the campaign against Iran might not become a prolonged war, and key interventions by Saudi Arabia. Such dramatic swings are not merely the product of speculation.

They reflect the extraordinary strategic importance of the Persian Gulf, particularly the Strait of Hormuz, through which roughly a fifth of the world’s oil supply normally flows. When shipping through this narrow waterway slows or stops, the consequences ripple instantly across continents. Tankers hesitate to enter conflict zones. Insurance costs soar. Energy traders price in the risk of further disruption. The result is volatility that affects everything from petrol pumps in Atlanta to fertiliser markets in India and manufacturing costs in East Asia. Governments are scrambling to contain the shock. Finance ministers from the Group of Seven have discussed releasing emergency oil reserves coordinated by the International Energy Agency.

A potential release of hundreds of millions of barrels would represent one of the largest interventions in energy markets since the Russia-Ukraine war disrupted global supplies in 2022. Yet even such a dramatic step would only cover a few days of global consumption. That stark arithmetic explains why markets remain anxious. Strategic stockpiles can calm panic temporarily, but they cannot replace sustained flows of crude from the Gulf. If Iran’s energy infrastructure remains damaged or tanker traffic through the Strait of Hormuz continues to face threats, the global economy may be confronting the largest oil shock in modern history. Political calculations in Washington are therefore colliding with economic realities.

Mr Trump has repeatedly suggested that the campaign against Iran is nearing success, even as officials speak about expanded military operations and new bombing phases. Such mixed signals have unsettled markets but also reveal a deeper constraint: energy prices are among the few global indicators capable of rapidly reshaping domestic politics. In the United States, rising gasoline prices have long been a political danger for any President. With midterm elections approaching and inflation already a sensitive issue, sustained oil price spikes could weaken public support for the war effort and damage economic confidence. Yet the global consequences extend far beyond American politics.

China, India, and South Korea remain among the largest buyers of Gulf energy exports, meaning that prolonged disruption would reverberate through Asian supply chains and global trade. Even if hostilities end quickly, the economic aftershocks will linger. Damaged infrastructure must be repaired, shipping routes restored and insurance markets stabilised. Wars can be halted by political decisions. Energy systems, however, recover far more slowly. That is why the real cost of this conflict will not be measured only in missiles and military targets, but in the fragile stability of the world’s energy lifeline.

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