Iranian Foreign Minister Abbas Araghchi delivered a formal warning to Israel and the United States on March 27, declaring that the Islamic Republic would exact a “heavy price” for what he described as crimes against Iranian sovereignty following a series of Israeli airstrikes that struck two of Iran’s largest steel manufacturing complexes and targeted multiple nuclear-related sites. The statement, delivered in a televised address and subsequently transmitted to foreign governments through diplomatic channels, represented one of Tehran’s most explicit threats since the conflict began.

The strikes on the steel factories, which Iranian officials identified as being among the most significant industrial facilities in the country’s manufacturing base, came as part of an expanding Israeli targeting campaign that has progressively moved beyond military installations to encompass dual-use industrial infrastructure. Israel has characterized such facilities as having strategic military value, pointing to their role in producing materials used in missile and weapons manufacturing programs.

The targeting of nuclear sites drew the sharpest language from Iranian officials, who accused the United States and Israel of “playing with fire” by striking facilities that they said housed materials and equipment of immense sensitivity. Iranian state media broadcast images of damage at one facility that officials described as a research and development site, though independent verification of the extent of the damage was not immediately possible due to restricted access.

The International Atomic Energy Agency, the United Nations body responsible for monitoring nuclear programs under the Non-Proliferation Treaty, confirmed Thursday that its inspectors had been denied access to Iranian sites for the 12th consecutive day. IAEA Director General Rafael Grossi issued a statement expressing grave concern about the agency’s inability to verify the safety and security of nuclear materials at facilities that had been subject to military strikes, calling the situation “unprecedented in the agency’s history.”

Araghchi specifically called out what he described as the joint nature of the American-Israeli campaign, arguing that Washington’s provision of intelligence, munitions, and logistical support for Israeli strikes made the United States equally responsible for all consequences. He warned that Iran reserved the right to respond against American interests and forces in the region at a time and in a manner of its choosing, language that U.S. military commanders in the Gulf have been treating as an active threat requiring heightened defensive posture.

The steel industry strikes drew additional attention because the targeted facilities employed tens of thousands of Iranian workers and represented a significant share of the country’s industrial output. Iranian officials and state media described scenes of devastation at both plants, though the government did not immediately release detailed casualty figures. Labor organizations inside Iran issued statements mourning what they described as the deliberate destruction of the country’s civilian economic capacity.

Western governments largely declined to comment on the specifics of the Israeli strikes, though several European foreign ministers privately expressed concern about the escalating scope of the campaign. The European Union’s foreign policy chief issued a statement calling for restraint and the protection of civilian infrastructure, language that fell short of explicit condemnation of the strikes but reflected growing unease in European capitals about the direction of the conflict.

The nuclear dimension of the strikes generated the most significant international diplomatic activity. China and Russia, both of which have longstanding ties to Iran’s civilian nuclear program, issued joint and separate statements condemning the attacks on nuclear facilities as violations of international law and demanded an immediate cessation of such strikes. Both governments called for an emergency session of the United Nations Security Council, where their permanent membership would give them veto power over any resolution endorsing the military campaign.

Within Iran, the government moved to consolidate public support behind the war effort, with state media broadcasting footage of crowds in Tehran and other major cities condemning what official commentators described as a coordinated American-Israeli attempt to destroy Iran’s national sovereignty and industrial heritage. The government issued new emergency decrees expanding wartime economic regulations and announced conscription measures intended to bolster military manpower.

Israeli officials did not publicly confirm or deny responsibility for the nuclear site strikes, adhering to a longstanding policy of ambiguity on such operations. However, senior Israeli government figures made clear in public statements that Israel considered the degradation of Iran’s nuclear capabilities to be a core strategic objective of the current campaign, language widely interpreted as implicit confirmation of responsibility.

Defense analysts outside the region observed that the strikes on nuclear sites carried risks beyond the immediate military and diplomatic fallout. Questions about the integrity of containment structures and the potential release of radiological materials had been raised by nuclear safety experts since the beginning of the conflict, and the IAEA’s inability to conduct on-site assessments left the international community without authoritative information about the actual conditions at affected facilities.

The humanitarian impact inside Iran was increasingly difficult to assess from outside the country, as the government had restricted independent media access and international organizations reported significant obstacles to relief operations. Estimates from regional monitoring groups suggested that displacement figures had grown substantially since the initial weeks of the conflict, with several provinces particularly affected by sustained strike activity.

Araghchi concluded his televised address by invoking Iran’s historical resilience and pledging that the country would emerge from the current conflict stronger, a message clearly directed as much at a domestic audience facing economic hardship and military losses as at the international community. Whether the threat of a “heavy price” translated into specific new military actions in the coming days would be closely watched by governments across the Middle East and beyond.