One hundred days ago, on February 28, the United States and Israel launched an illegal war of aggression against Iran. The war is being waged by the world’s most powerful imperialist powers against a historically oppressed nation. 

The resistance of the Iranian people, notwithstanding the reactionary character of the clerical regime, is politically legitimate and of a heroic character. The working class internationally must defend Iran unconditionally against imperialist subjugation.

The “negotiations” currently being carried out by the Trump administration at gunpoint are a fraud. In an interview this weekend, Trump declared that if Iran does not accept his demands, “I’m going to blow the hell out of them.” Even if the Trump administration agrees to a “ceasefire,” any agreement with the gangsters in the White House will just be as meaningful as the “peace” deal in 2025 that set the stage for this year’s war.

On Sunday night, Israel attacked Tehran. In Lebanon, the Israeli bombardment, escalating even amid the supposed negotiations, has killed at least 3,593 people and driven over a million from their homes—a toll that exceeds the 3,468 Iranians killed, among them seven infants and 376 children, with more than 26,500 wounded.

In the course of the war, imperialism plumbed new depths of barbarism. Trump’s threats to extinguish “a whole civilization” and Hegseth’s vow to wage war with “no quarter, no mercy” will go down in history as expressions of an oligarchy that has abandoned all pretense to legality. The imperialist powers now wage wars of oppression and subjugation in the open, with methods pioneered by the Nazis.

Despite the brutal and murderous character of the US-Israeli onslaught, however, imperialism has failed to achieve a single one of its aims. It has not overthrown the Iranian government, broken Iran’s military or seized control of the Strait of Hormuz. 

The war has had two major effects: a deepening of the global crisis of the capitalist system and an enormous escalation of the global class struggle, not least within the United States.

The US debacle in Iran has accelerated the crisis of the US-led economic order. The European Central Bank reported in June that central banks are fleeing US Treasury bonds for gold, which has overtaken the euro to become the second-largest reserve asset—27 percent of global reserves, up from 20 percent a year earlier. The US national debt has passed $39 trillion.

It is the working class—in the United States and internationally—that is bearing the cost of the war. The closure of the Strait of Hormuz has driven gas at the pump up by more than 50 percent, the price of staples like tomatoes by nearly 40 percent and inflation to 3.8 percent, its highest since 2023. 

Trump has seized on the war to intensify his assault on social programs, declaring in April that “we’re fighting wars” and that it is therefore “not possible for us to take care of day care, Medicaid, Medicare, all these individual things.” The World Food Programme warned that the war could push an additional 45 million people into acute hunger, a record level, with the poorest, import-dependent countries of Africa and Asia hit hardest.

In response to the surge in prices and the escalating cost-of-living crisis, the working class has begun to fight back. The past three months have seen a significant growth of working-class struggle in the United States: the first strike on the Long Island Rail Road in more than three decades; a three-week walkout by 3,800 meatpacking workers at JBS in Greeley, Colorado, the first in the industry in more than 40 years; strikes by teachers in California and a statewide walkout in North Carolina; strikes by nurses in New Orleans and California against unsafe staffing; a strike by graduate students at Harvard University; and the rebellion now sweeping the auto parts industry.

The class struggle is erupting internationally—in the mass anti-government protests in Kenya, the rebellion of tens of thousands of workers in the industrial suburbs of Delhi and the hunger strike of coal miners in Turkey. In the first quarter of 2026, eight European countries recorded 458 strikes, among them national general strikes in Belgium and Italy, and regional general strikes in Spain’s Andalusia and Basque Country. Argentina mounted a national general strike against the Milei government in February, and 1.7 million government employees walked out across the Indian state of Maharashtra.

The contradictions that are driving imperialism to war are also driving the working class into struggle. The growth of the class struggle springs from the same crisis that produces the war. Out of that crisis emerges the only social force capable of putting an end to it. War and social revolution are two sides of the same historical process.

Enormous and growing opposition is developing in the United States and throughout the world to the US–Israeli war of aggression against Iran and to the broader drive toward war, austerity and dictatorship. But opposition, left to itself, is dissipated and diverted. It must be armed with a program, perspective and leadership.

The fight against war cannot be waged through appeals to the governments and parties that are waging it. In the US, the Democratic Party greeted the murder of Iran’s leaders with cheers and financed Trump’s military budget. The European imperialist powers have backed the war and politically justified it, while pouring €800 billion into rearmament as they escalate the proxy war against Russia, which they arm and direct.

Opposition to imperialism requires developing struggles of workers in the United States, Europe and across the world—against war, austerity and dictatorship—into a conscious political movement armed with a socialist program. To put an end to war and barbarism, the capitalist system must be abolished.

This is the perspective of the Socialist Equality Party and the International Committee of the Fourth International. We call on every worker and young person who opposes this war to take it up and to build the revolutionary leadership the working class needs.