The conflict between Iran and the United States has long been studied as a geopolitical standoff, marked by a cold war of sanctions, proxy forces, and nuclear brinkmanship in recent decades. As of 2026, that framework no longer holds, since what once seemed like a managed rivalry has collapsed into open warfare, dragging many countries into it, and millions of civilians across West Asia are facing displacement, medical collapse, economic ruin, and death on account of the open hostilities. The human security consequences are no longer theoretical; they are increasingly documented, ongoing, and devastating.

From Cold Conflict to Open War

For decades, the United States and Iran maintained a posture of hostility without direct military confrontation. It changed in stages over the years. The collapse of the 2015 Joint Comprehensive Plan of Action (JCPOA) after the Trump administration's withdrawal in 2018 marked the beginning of a new phase of a "maximum pressure" campaign.  Various sanctions were reimposed, crippling Iran's economy. Iran's currency entered freefall, particularly after a brief Israeli–US military exchange known as the Twelve-Day War in June 2025, which targeted Iranian nuclear and military infrastructure.

By late December 2025, Iran's economic collapse had produced its most serious popular uprising since the 1979 revolution. Protests spread across more than 200 cities, fuelled by record inflation and crumbling infrastructure. The Iranian government's response was catastrophic, and security forces massacred thousands of demonstrators, with Iran's own Ministry of Health reporting at least 30,000 killed in the January 2026 crackdown. This is the largest such killing in modern Iranian history.

On 28 February 2026, the United States and Israel launched joint military operations against Iran that were codenamed Operation Epic Fury and Operation Roaring Lion, respectively. They started by striking Tehran and other cities across the country, killing Supreme Leader Ali Khamenei and several senior military and government officials. Hundreds of civilians died in the first days alone, including more than 100 children at a primary school in southern Iran. What may have been feared as a potential escalation had become all-out war, leading to many casualties and damage to property and infrastructure.

The Humanitarian Collapse

The scale of civilian suffering since February 2026 has been severe. According to UNHCR, the escalation triggered major........

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