On February 28, 2026, the United States and Israel launched a massive joint military operation against Iran after intelligence revealed that Tehran had been quietly rebuilding the nuclear infrastructure destroyed in last year’s strikes. The operation — dubbed “Operation Epic Fury” by the U.S. and “Roaring Lion” by Israel — hit targets across at least nine Iranian cities, killed Supreme Leader Ayatollah Ali Khamenei and 40 senior military commanders, and marked the second major American strike on Iran’s nuclear program in eight months. It was, by any measure, a dramatic escalation of a conflict that the Trump administration had declared finished after the first round of bombings in June 2025. The justification was straightforward on the surface: satellite imagery from late January 2026 showed new construction over damaged facilities at Natanz and Isfahan, Iran had expelled IAEA inspectors, and analysts had identified ongoing excavation at a site known as “Pickaxe Mountain” believed to be a new underground nuclear facility.
But the full picture is more complicated. A July 2025 Pentagon assessment had already concluded that the first strikes — Operation Midnight Hammer — set Iran’s program back only about two years, not the total obliteration Trump had claimed. Iran still retained roughly 400 kilograms of uranium enriched to 60 percent. The question of whether a second wave of strikes was necessary, proportionate, or strategically sound is now one of the most consequential foreign policy debates in a generation. This article breaks down what happened during both rounds of strikes, what the evidence actually showed about Iran’s rebuilding efforts, the casualty toll and Iranian retaliation, and what fact-checkers have found about the administration’s stated justifications.
Table of Contents
- What Evidence Showed Iran Was Rebuilding Its Nuclear Program After Operation Midnight Hammer?
- How Effective Were the First Strikes, and Why Did They Fall Short of Trump’s Claims?
- What Happened During Operation Epic Fury and How Large Was the Joint U.S.-Israel Assault?
- What Has the Human Cost Been, and What Are the Strategic Tradeoffs?
- What Did Fact-Checkers Find About Trump’s Stated Justifications for the Strikes?
- What Happened to International Monitoring and Why Does It Matter?
- What Comes Next After the Leadership Decapitation and Ongoing Strikes?
- Conclusion
- Frequently Asked Questions
What Evidence Showed Iran Was Rebuilding Its Nuclear Program After Operation Midnight Hammer?
The case for the second strike rested primarily on satellite imagery and the absence of international inspectors on the ground. According to analysis published by CSIS and reported by Bloomberg and the Times of Israel, commercial satellite photos taken in late January 2026 showed that iran had constructed new roofs over damaged facilities at both Natanz and Isfahan. These structures effectively blocked overhead surveillance — a move analysts interpreted as an attempt to conceal reconstruction activity. At Isfahan specifically, tunnel entrances had been backfilled, which experts said was designed to prevent collapse from future airstrikes and seal vulnerable access points rather than abandon the sites. Perhaps more concerning to Western intelligence agencies was continued digging at Kūh-e Kolang Gaz Lā — nicknamed “Pickaxe Mountain” — located just a few hundred meters south of the main Natanz complex.
CSIS satellite analysis suggested this was likely a new underground nuclear facility, potentially designed to be deep enough to resist the bunker-busting munitions used in June 2025. Combined with Iran’s decision to expel IAEA inspectors, which eliminated the only independent on-the-ground monitoring of the country’s nuclear activities, the intelligence community assessed that Iran was not winding down its nuclear ambitions but actively adapting them. However, it is worth noting a critical limitation in this evidence: without inspectors present, much of the assessment relied on imagery interpretation and inference. Building new roofs over damaged sites could indicate reconstruction, but it could also reflect basic cleanup and salvage operations. The backfilling of tunnels could be defensive hardening or simply structural stabilization of a bombed-out facility. The ambiguity is precisely the kind of gap that IAEA access was designed to fill — and that gap now works against any definitive conclusion about Iran’s intent.
How Effective Were the First Strikes, and Why Did They Fall Short of Trump’s Claims?
When President trump authorized Operation Midnight Hammer on June 22, 2025, he told the American public that Iran’s nuclear facilities had been “completely and totally obliterated.” The strikes targeted three major sites — Fordow, Natanz, and Isfahan — using bunker-busting bombs and Tomahawk cruise missiles. In the immediate aftermath, the administration projected confidence that Iran’s nuclear program had been dealt a fatal blow. That narrative began to unravel within weeks. A Pentagon assessment completed in July 2025 — just one month after the strikes — concluded that Iran’s nuclear program had been set back approximately two years, not destroyed. The assessment also confirmed that Iran retained about 400 kilograms of uranium enriched to 60 percent, material that was not eliminated in the bombings.
The Arms Control Association noted that this stockpile, while not weapons-grade at 90 percent enrichment, represented a significant latent capability that could be further enriched relatively quickly if Iran chose to do so. The gap between Trump’s public statements and the Pentagon’s own assessment is not a minor discrepancy — it goes to the core question of whether the first strikes achieved their stated objective. This matters because the failure to fully neutralize the program in June 2025 is what created the conditions for a second strike. If the administration’s original claims had been accurate, there would have been nothing to rebuild. Instead, the pattern that emerged — strike, claim total victory, discover the problem persists, strike again — raises serious questions about whether military action alone can resolve a nuclear proliferation challenge of this scale, or whether the cycle simply repeats with escalating consequences each time.
What Happened During Operation Epic Fury and How Large Was the Joint U.S.-Israel Assault?
The scale of Operation Epic Fury on February 28, 2026 dwarfed the first round of strikes. Israel deployed approximately 200 fighter jets striking roughly 500 targets across western and central Iran, making it the largest air operation in Israeli military history. Targets included not just nuclear facilities but also air defense systems and missile launchers — a significant broadening of the strike scope compared to Operation Midnight Hammer, which had focused more narrowly on nuclear infrastructure. The U.S. contributed B-2 bombers and additional strike assets under its own operational command. The most consequential outcome was the killing of Supreme Leader Ayatollah Ali Khamenei, whose death Iran confirmed before declaring 40 days of national mourning.
Forty senior iranian military commanders were also killed, including Chief of Staff Abdolrahim Mousavi. The decapitation of Iran’s military and political leadership went far beyond a nuclear counterproliferation operation — it was a regime destabilization strike. Whether that outcome was a primary objective or a secondary effect of the bombing campaign, it fundamentally changed the nature of the conflict from a nuclear dispute to something much broader. For comparison, Operation Midnight Hammer in June 2025 targeted three specific facilities with the stated goal of destroying nuclear infrastructure. Operation Epic Fury struck nine cities, eliminated Iran’s head of state, and dismantled much of its senior military command. The escalation ladder, in other words, did not stay on the same rung.
What Has the Human Cost Been, and What Are the Strategic Tradeoffs?
The casualty figures from Operation Epic Fury are still emerging, but initial reports paint a grim picture on all sides. Iran’s Red Crescent reported 201 civilians killed and 747 injured on the first day alone — numbers that will almost certainly rise as rescue operations continue and more remote strike sites are assessed. On the American side, CENTCOM confirmed that three U.S. service members were killed and five seriously wounded during the operation, according to NBC News and Air and Space Forces Magazine. Iran responded with retaliatory missile strikes against U.S. bases and allied positions across the Middle East, targeting locations in Israel, Jordan, Saudi Arabia, Qatar, Kuwait, the UAE, and Bahrain.
The breadth of Iran’s retaliation — hitting seven countries — reflects both its missile capability and its willingness to escalate the regional conflict well beyond its own borders. For countries like Qatar and Bahrain, which host major U.S. military installations, the strikes forced an uncomfortable reckoning with the costs of hosting American forces during an active conflict with a regional power. The strategic tradeoff is stark. The strikes may have set Iran’s nuclear program back further and eliminated key leadership figures. But they also killed hundreds of civilians, cost American lives, triggered a multi-country retaliatory campaign, and created a leadership vacuum in a nation of 88 million people with no clear succession plan. Whether the net result makes the region safer or more dangerous depends heavily on what fills that vacuum — and that is a question no amount of bombing can answer.
What Did Fact-Checkers Find About Trump’s Stated Justifications for the Strikes?
President Trump justified the second round of strikes by stating that Iran “rejected every opportunity to renounce their nuclear ambitions” and had “attempted to rebuild their nuclear program.” While the satellite evidence does support the claim that Iran was conducting construction activity at previously struck sites, fact-checkers identified significant problems with other parts of the administration’s case. PBS reported that a 2025 federal government assessment found Iran was still years away from producing long-range missiles capable of threatening the United States — a finding that directly contradicts the urgency the administration projected in its public messaging. PolitiFact similarly noted the disconnect between the administration’s portrayal of an imminent Iranian threat and the intelligence community’s own timeline assessments.
The framing of the strikes as a response to an imminent danger, rather than a longer-term proliferation concern, is a meaningful distinction: the legal and political thresholds for preemptive military action are significantly higher when the threat is not immediate. Trump also stated on February 28 that “heavy and pinpoint bombing” would “continue uninterrupted throughout the week or as long as necessary,” and urged the Iranian people to “take over” their government. That latter statement — effectively calling for regime change from the podium — goes beyond counterproliferation and into explicit advocacy for the overthrow of a foreign government. Whether or not one agrees with that goal, it represents a significant policy position that was not part of the original justification for Operation Midnight Hammer and raises questions about whether the nuclear issue is the actual driver of policy or a pretext for broader objectives.
What Happened to International Monitoring and Why Does It Matter?
One of the most underreported aspects of this crisis is the collapse of international nuclear monitoring in Iran. After the first strikes in June 2025, Iran expelled IAEA inspectors — the only independent observers with authority to verify what was happening inside Iranian nuclear facilities. Without them, the international community is effectively flying blind, relying entirely on satellite imagery and signals intelligence to assess Iran’s nuclear status.
This matters because the entire architecture of nuclear nonproliferation depends on verification. The IAEA’s role is not just to catch cheating — it is to provide a baseline of credible information that all parties can use to make informed decisions. Without that baseline, every assessment becomes contested, every satellite image becomes a Rorschach test, and the threshold for military action drops because there is no neutral authority to say “the situation is or is not as bad as claimed.” The expulsion of inspectors did not just blind the international community to Iran’s activities — it removed the one mechanism that might have provided an alternative to further military strikes.
What Comes Next After the Leadership Decapitation and Ongoing Strikes?
The killing of Ayatollah Khamenei and 40 senior commanders creates a succession crisis without modern precedent in Iran. The Islamic Republic’s governance structure concentrates enormous authority in the Supreme Leader, and there is no automatic or universally accepted mechanism for replacing him under these circumstances. The power struggle that follows — between the Revolutionary Guard, surviving clerical figures, and potentially reformist factions — could take months or years to resolve and could produce outcomes ranging from a more moderate government open to negotiations to a hardline military junta with even less interest in diplomatic engagement.
Trump’s public call for the Iranian people to “take over” their government adds another volatile element. Whether that statement encourages democratic reform, emboldens armed opposition groups, or simply hardens nationalist resolve against foreign interference depends on dynamics inside Iran that Washington has historically struggled to predict or influence. What is clear is that the situation has moved well beyond a nuclear counterproliferation operation into a full-spectrum confrontation with consequences that will unfold over years, not weeks.
Conclusion
The second round of U.S. strikes on Iran represents a significant escalation driven by evidence of Iranian rebuilding efforts but shaped by a pattern of overclaiming and mission creep. The first strikes in June 2025 were sold as a complete solution but achieved only a partial setback. The second strikes in February 2026 went far beyond nuclear targets to include regime leadership and military infrastructure across nine cities.
The result is a fundamentally altered Middle East, with Iran’s government decapitated, its retaliatory missiles hitting seven countries, and the international monitoring architecture that might have provided off-ramps now dismantled. For Americans trying to evaluate these events, the key facts are these: the Pentagon’s own assessment found the first strikes set Iran back only two years, not permanently; Iran retained enriched uranium that the bombings did not destroy; the intelligence community assessed Iran was years away from long-range missile capability; and the second operation killed 201 civilians, three U.S. service members, and Iran’s head of state. Whether this sequence of events constitutes a coherent strategy or an escalatory spiral with no clear endpoint is a question that deserves rigorous public debate — not triumphant declarations of mission accomplished.
Frequently Asked Questions
Did the first U.S. strikes in June 2025 destroy Iran’s nuclear program?
No. A July 2025 Pentagon assessment found the strikes set Iran’s program back approximately two years. Iran also retained about 400 kilograms of uranium enriched to 60 percent, which was not eliminated.
What evidence showed Iran was rebuilding after the first strikes?
Satellite imagery from late January 2026 showed new roofs built over damaged facilities at Natanz and Isfahan, continued excavation at a site called “Pickaxe Mountain” near Natanz, and backfilled tunnel entrances at Isfahan. Iran had also expelled IAEA inspectors, removing independent on-the-ground monitoring.
Was Ayatollah Khamenei killed in the February 2026 strikes?
Yes. Iran confirmed the death of Supreme Leader Ayatollah Ali Khamenei during Operation Epic Fury on February 28, 2026, and declared 40 days of national mourning. Forty senior military commanders, including Chief of Staff Abdolrahim Mousavi, were also killed.
How many casualties resulted from Operation Epic Fury?
Iran’s Red Crescent reported 201 civilians killed and 747 injured on the first day. The U.S. military reported three service members killed and five seriously wounded.
Did Iran retaliate after the February 2026 strikes?
Yes. Iran launched retaliatory missiles at U.S. bases and allied positions in Israel, Jordan, Saudi Arabia, Qatar, Kuwait, the UAE, and Bahrain.
Is Iran capable of building a nuclear weapon?
According to a 2025 federal government assessment cited by PBS and PolitiFact, Iran was still years away from producing long-range missiles. However, its retention of 400 kg of 60 percent enriched uranium represents a latent capability that could theoretically be further enriched toward weapons-grade levels.