Failed Iran Nuclear Diplomacy and Shifting Justifications Preceded Operation Epic Fury

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Two days before the bombs fell, Secretary of State Marco Rubio stood before reporters and said something that tells you nearly everything about why the diplomacy collapsed. Iran, he said, “refuses to talk about the ballistic missiles to us or to anyone and that’s a big problem.” The date was February 26, 2026. Operation Epic Fury launched on February 28.

Here’s what makes that statement so revealing: Iran had never agreed to discuss ballistic missiles as part of nuclear negotiations. Not in 2025, not in 2026, not ever. Linking the two tracks wasn’t a new American demand that Iran had recently rejected.

It was a built-in condition that Iran had clearly ruled out from the beginning. The Trump administration put it back in, Iran refused, and then called that refusal proof of bad faith.

The strongest case for that linkage deserves to be taken seriously. The Obama administration’s decision to separate missiles from the JCPOA was not praised by everyone, even among supporters of the deal. Senior Obama-era officials including Wendy Sherman and Robert Einhorn raised concerns about the missile exclusion. Sherman’s pre-deal statements called for missiles to be addressed, though critics and supporters alike debated whether the omission constituted a fundamental flaw. The arms control logic is simple: a nuclear agreement that limits warheads but not delivery systems addresses only half the threat.

Since 2015, Iran’s missile program advanced materially. Iran tested and deployed more and more capable ballistic missiles with ranges covering Israel, Saudi Arabia, and U.S. Bases across the region. Analysts including those at CSIS and the Washington Institute have documented that Iran’s precision-strike capabilities improved greatly in the post-JCPOA period.

Brookings Institution research has shown that the strategic value of Iran’s missile arsenal cannot be separated from the nuclear question. The same delivery systems that carry conventional warheads would carry nuclear ones.

On this view, the Trump administration was not inventing a new demand. It was fixing what critics across the political spectrum had called a built-in flaw in the original deal.

The problem, from a diplomatic standpoint, is that adding missile constraints as a precondition, rather than as a subject for negotiation within a broader framework, created a dead end. It meant no nuclear agreement could move forward unless Iran first gave in on a separate issue. Iran had clearly ruled that issue out from the start, regardless of the merits of the linkage argument.

That sequence explains the diplomatic collapse that preceded Operation Epic Fury. Whether you think the strikes were justified or reckless, the record of what happened in the months before February 28 is worth piecing together carefully. The administration’s stated reason for why diplomacy failed kept shifting. The evidence for its main claim, that Iran was rebuilding nuclear facilities while stalling, was disputed by independent observers. And the military buildup itself may have closed off the diplomatic options it was supposedly designed to support.

What Was on the Table

The formal diplomatic engagement between the U.S. And Iran began in April 2025. Steve Witkoff, a real estate developer and longtime Trump associate serving as White House special envoy, led the American side. Witkoff met with Iranian Foreign Minister Abbas Araghchi in Oman, with the sultanate’s government serving as intermediary. Both sides called the initial rounds “constructive,” which in diplomatic terms means: we didn’t walk out, but we’re nowhere near agreement.

They amounted to asking Iran to give up the three pillars of what Tehran views as its way of offsetting America’s and Israel’s much larger conventional military forces.

To make the offer more appealing, administration officials claim they presented Iran with something truly unusual in the history of nonproliferation diplomacy: permanent free nuclear fuel on a long-term basis. As a senior U.S. Official described it in a formal briefing where officials agreed to be quoted by name, the offer was meant to address Iran’s stated need for civilian nuclear power without requiring domestic enrichment.

Iran’s position, stated clearly and repeatedly by Araghchi, was that it had every right under the Nuclear Non-Proliferation Treaty to enrich uranium for peaceful purposes. The NPT has three pillars: non-proliferation (preventing the spread of nuclear weapons), disarmament (nuclear states commit to pursue elimination of their arsenals), and peaceful use of nuclear energy. It recognizes five specific nuclear-weapon states and commits all others to non-acquisition.

Throughout the original JCPOA negotiations, Iran had insisted on keeping the legal and technical ability to enrich uranium at low levels for civilian purposes. The 2015 deal allowed it to do so under strict International Atomic Energy Agency (IAEA) monitoring. The IAEA is an autonomous intergovernmental organization within the UN system — one that reports to the General Assembly and Security Council — and its mandate includes inspecting nuclear sites. The Trump administration’s zero-enrichment demand went further than what even the Obama-era negotiators had required.

Araghchi also drew a hard line on scope. He insisted that talks should cover “solely the nuclear issue,” while Trump had publicly demanded any deal cover “no nuclear weapons, no missiles, no this, no that.” From Iran’s perspective, and from that of analysts who supported the original JCPOA framework, the missile demand was an attempt to quietly expand the talks beyond their original purpose. It was an attempt to use nuclear talks to pull out broader strategic concessions that went well beyond nonproliferation.

Administration officials and critics of the original JCPOA argued the opposite: that missile constraints were central to nonproliferation goals rather than an expansion beyond them. Delivery systems determine the strategic value of a nuclear arsenal. A deal limiting warheads while leaving delivery systems unchecked addressed only part of the threat. On this view, the scope of “nonproliferation” properly understood had always included the means of delivery. The JCPOA’s leaving out missiles was the anomaly, not the Trump administration’s effort to include them.

Nuclear weapons are dangerous; ballistic missiles are the delivery system. Limiting one without the other is like taking someone’s bullets while leaving them the gun. Arms control analysts have long noted that missiles armed with nuclear warheads are far more dangerous than the same missiles carrying conventional explosives. Arms control experts therefore treat them differently depending on what they can carry.

The Shifting Rationales

The administration’s stated reason for why military action might become necessary kept changing in the months before the strikes.

The first rationale was the nuclear program itself. In June 2025, the U.S. And Israel conducted Operation Midnight Hammer, a series of strikes on Iranian nuclear facilities at Fordow, Natanz, and Isfahan using B-2 stealth bombers and submarine-launched Tomahawk cruise missiles. The stated purpose was to set back Iran’s atomic program and strengthen the American negotiating position for later talks.

By January 2026, Iran was shaken by anti-government protests that resulted in significant loss of life, with human rights sources documenting figures ranging from approximately 4,200 to 12,000 or more depending on source and methodology. The Trump administration’s main stated concern had shifted to the violent crackdown on Iranian citizens. Trump issued statements of support for the protesters and suggested American military action was being considered in response to the domestic crackdown. An Iranian official told Reuters that Trump had said “help was on its way” to the protesters.

By early 2026, the focus had shifted again, this time to Iran’s ballistic missile arsenal. Trump’s State of the Union gave significant attention to Iran’s conventional strike capabilities. Rubio’s repeated statements about weapons delivery systems as the dealbreaker came shortly thereafter. On February 28, the day of the operation, Trump’s public messaging folded all three justifications together. The atomic program, the missile arsenal, support for regional proxy groups, and the crackdown on protesters were all presented as separate but related grounds for the strikes.

Why the rationale kept shifting is not clear from the public record. It could reflect genuine strategic adjustment tracking a genuinely shifting threat picture. The protest crackdown was the dominant story in January 2026. The nuclear rebuilding evidence, emerged in February. The missile issue came into focus during Rubio’s Geneva talks. On this reading, each rationale reflected the main concern at that moment. The coming together of all three in the February 28 strike announcement represented a combined threat assessment rather than a made-up justification.

It could also reflect a process of testing different public narratives to gauge political viability. Or it could reflect something closer to working backward: finding reasons to justify a decision after it was already made, matching stated reasons to whatever military targets were already on the list rather than identifying a consistent strategic objective. A genuine policy shift would be supported by intelligence assessments showing each threat becoming newly urgent at the moment it was stressed publicly. After-the-fact justification would be suggested by evidence that targeting decisions came before the public rationale.

The public record cannot resolve this question, but the pattern is documented.

Sources: Fortune reporting on Trump’s decision; Times of Israel on Rubio’s statements; 2026 Iran-United States crisis timeline.

The Rebuilding Claim and What the IAEA Said

The administration’s main justification for why diplomacy had failed was that Iran was using the negotiations to buy time while rebuilding nuclear facilities destroyed in the June 2025 strikes. A senior U.S. Official stated with confidence that Iran was “rebuilding everything that had been destroyed.” This claim did a lot of work in the pre-strike period. If true, it would support the administration’s claim of Iranian bad faith and provide a rationale for preemptive military action.

The International Atomic Energy Agency presented a much more cautious picture. According to IAEA reports seen by the Associated Press in February 2026, Iran had denied the agency access to nuclear facilities struck in June 2025, preventing inspectors from checking the actual state of repairs. The agency reported satellite imagery showing “regular vehicular activity” around Isfahan and signs of “activities being conducted” at Fordow and Natanz. It stated clearly that “without access to these facilities it is not possible for the Agency to confirm the nature and the purpose of the activities.”

The U.S. claimed Iran was rebuilding. The IAEA said it couldn’t verify what Iran was doing because Iran had restricted access — not the same thing.

Satellite imagery analysis from the Center for Strategic and International Studies — published in October 2025 — showed some construction activity at Pickaxe Mountain. Pickaxe Mountain is a deeply buried underground facility roughly one mile south of the Natanz enrichment site. Iranian officials had previously announced plans to build a more secure centrifuge assembly facility there, partly in response to prior sabotage. Whether this indicated a push toward nuclear weapons development or simply hardening of existing infrastructure remained disputed among analysts.

No declassified intelligence assessment was released to support the specific claim that Iran had made major progress in rebuilding. What the administration presented as clear evidence of Iranian bad faith, independent observers saw as ambiguous satellite imagery and restricted inspection access — facts consistent with multiple interpretations but not proof of the “buying time” narrative.

The Commitment Trap: When the Armada Becomes the Policy

Alongside the diplomatic engagement, the Trump administration was building up military power in the Middle East at a scale not seen since the 2003 Iraq War. By February 19, 2026, the U.S. military presence included the USS Abraham Lincoln carrier strike group — confirmed deployed by late January — guided-missile destroyers, advanced fighter aircraft, and sustained bomber operations. A second carrier strike group, the USS Gerald R. Ford, was also reported in the region, though its deployment status by that date could not be fully confirmed. Trump himself announced the buildup on social media on January 28. He declared that “a massive Armada is heading to Iran.”

In coercive diplomacy theory, this is the intended move: the threat of force, not its use, is what changes the other side’s behavior. It’s meant to bring the adversary to the table, not to replace the table.

But military buildups create their own momentum, and this is the part that strategic theorists call the commitment trap: the situation where publicly deploying a large force makes it politically costly to back down, creating pressure to settle the question through military action even when diplomacy might still be possible. Once large forces are deployed and positioned in the region, keeping them on full alert and ready to strike brings significant costs in money, logistics, and personnel strain.

Political leaders who have publicly announced that an armada is heading toward an adversary face reputation costs if that armada is then pulled back without having been used. The president’s political base may see withdrawal as weakness, especially after months of buildup. The longer the deployment continues without resolution, the greater the pressure to end the uncertainty through military action rather than diplomacy.

One analyst at the International Institute for Strategic Studies described the dynamic in February 2026: the current posture “can likely only be sustained for so long before Trump will have to decide to make good on his threats or withdraw.” That’s not a criticism of the deployment, exactly. It’s a description of the built-in logic it created. Having assembled the force and announced it publicly, the administration faced growing pressure to either strike or withdraw. Both options carried political costs.

Administration officials might argue that this pressure was welcome — that a believable threat of military action was precisely what brought Iran to the negotiating table at all. Without the military buildup, Iran’s leadership would have had no reason to take American demands seriously. But diplomacy did not succeed, and the pressure itself may have limited what kinds of settlements could have been reached.

Trump’s comments in the final days before the strikes suggested he had already made the decision to follow through. In a call with reporters on February 27, he stated: “I’m not happy with the fact that they’re not willing to give us what we have to have.” And then there was the February 13 statement, which complicated everything: Trump said that regime change in Iran would be “the best thing that could happen.”

Administration officials might argue that this statement was a deliberate pressure tactic, signaling maximum ambition to pull out maximum concessions, rather than a sincere policy commitment. This would be consistent with classical coercive diplomacy theory, which holds that overstating one’s objectives can shift the bargaining range in the coercing party’s favor. Coercive strategy literature has long recognized that believable threats of escalation can be reasonable tools of statecraft rather than evidence of bad faith. This includes threats that go beyond a negotiator’s actual bottom line.

Critics counter that such statements, regardless of intent, undermine the credibility of any negotiated outcome from the Iranian side. A government cannot be expected to sign an agreement with a counterpart that has publicly called for its removal. The survival of the agreement would depend on the survival of the regime the other side has said it does not wish to preserve.

The public record does not resolve which interpretation better describes the administration’s intent. It cannot confirm whether the statement was a calculated pressure tactic or a sincere expression of policy preference that closed off diplomatic space.

Iran’s Temporary Suspension Offer and the Administration’s Rejection

In mid-February 2026, Iran reportedly presented a proposal for a temporary enrichment suspension. Iran’s documented draft proposed a seven-year halt — longer than the three-to-five-year range U.S. officials had publicly floated as their expectation. Either way, it fell short of the permanent ban the administration demanded. It was, however, a significant concession that would have extended Iran’s breakout time and provided a period during which inspectors could verify compliance. The administration rejected it as insufficient.

Iranian Foreign Minister Araghchi, speaking after the Geneva talks concluded on February 27, said Iran and the U.S. had “moved closer to agreement” on certain issues, citing “significant progress on some issues.” He also noted that Iran was “approaching these talks with more caution” after Israel had launched an attack during U.S.-Iranian nuclear negotiations the previous June. Iran was being asked to negotiate seriously with a partner that had struck its nuclear facilities while previous negotiations were underway.

A prominent Iranian security adviser, Ali Shamkhani, stated on February 26 that “if the main issue of the negotiations is Iran’s non-development of nuclear weapons, this is in line with the Leader’s fatwa and Iran’s defense doctrine, and an immediate agreement is within reach.” A fatwa is a formal legal ruling or opinion issued by a qualified Islamic legal scholar (mufti), not necessarily a senior authority in a hierarchical sense. Iran’s Supreme Leader had previously issued one declaring nuclear weapons forbidden (first publicly in October 2003), though scholars and critics dispute whether it constitutes a binding religious decree in the traditional sense, with many characterizing it as a political statement rather than a formal fatwa. Iran’s defense doctrine refers to Iran’s official military policy. The conditional matters: if the talks were about nuclear weapons, Iran was open. If they were also about missiles and regional activities, Iran was not.

Whether the temporary suspension offer represented a genuine opening or a stalling tactic cannot be resolved from public sources. The administration called it time-buying. Iran called the rejection proof that the U.S. wasn’t negotiating in good faith. Both interpretations fit the available evidence.

Congressional Notification and the Limits of Oversight

Before the strikes, the administration notified the Gang of Eight congressional leaders — a step that fell short of a formal War Powers Resolution filing. As we’ve covered in our analysis of the joint U.S.-Israel operation and congressional approval questions, the administration claimed authorization under the president’s constitutional authority as commander in chief. Administration-aligned figures also cited congressional war authorizations passed after 9/11 and before the Iraq War, though legal experts widely disputed that argument as unconvincing, and it was unclear whether it represented a unified formal position.

Congressional members who received classified briefings before the strikes reported, in public statements afterward, that they had received limited information about the administration’s actual goals or the full scope of the operation. Senator Tim Kaine called the strikes “a colossal mistake” and demanded Republicans immediately return to session to vote on his war powers resolution. Senator Rand Paul, who had been the only Republican to vote against a prior June war powers resolution, said: “My oath of office is to the Constitution, so with studied care, I must oppose another Presidential war.” Rep. Warren Davidson (R-Ohio) also expressed conditional opposition to the February 28 strikes.

Most congressional Republicans either supported the strikes or declined to take a position. Many Democrats called for a War Powers vote, though a number simultaneously opposed the strikes outright rather than treating the procedural and substantive questions as separate.

The question worth asking is whether Congress would have reached different conclusions if the notification had fully described the state of the diplomatic negotiations. That would include Iran’s counterproposals, the administration’s assessment of their viability, and the ways in which the military buildup may have limited diplomatic options.

Our earlier coverage of congressional war powers explains why the built-in answer is probably no. Congress is deeply divided along party lines. The Constitution is also genuinely unclear about how much war-making power the president has on his own. For both reasons, congressional limits are largely ineffective in practice. But the question of what information Congress received remains open.

The pattern of concern among members with access to classified briefings suggests that what they were told was either limited in scope or framed in a way that stressed the case for military action. It did not present a full picture of the diplomatic record, including the counterproposals Iran had put forward. Whether that reflects deliberate framing or the built-in difficulty of conveying diplomatic nuance in classified briefings is not something the public record can resolve.

What the Pre-Strike Record Shows

The administration entered negotiations with demands that went well beyond the 2015 JCPOA framework. Iran refused to accept the broadest of those demands. The administration called that refusal bad faith. The military buildup created institutional and political pressure to resolve the standoff through military action. And the evidence for the central claim, that Iran was actively rebuilding while stalling, was disputed by the one international body with direct inspection authority.

What the record does not show, because the public sources don’t support it, is whether a negotiated settlement was achievable. Iran’s temporary suspension offer was real. Whether it was a genuine opening or a tactical delay cannot be known from outside the room. The administration’s zero-enrichment demand was a major departure from prior American negotiating positions. Whether that departure reflected a genuine strategic judgment or a deliberate closing off of diplomatic options is also unknowable from outside the room.

The Arms Control Association’s post-strike assessment and the Stimson Center’s expert reactions both wrestle with the same uncertainty: was the diplomatic collapse the result of fundamental disagreements no negotiation could bridge, negotiating failures on one or both sides, or the built-in pressure created by the military buildup itself? It was probably some mix of all three, in proportions that may never be fully known.

What can be said with confidence is this: the administration’s stated justifications accumulated and expanded before the strikes, with nuclear and missile threats cited consistently while the crackdown on protesters was added as a new element after December 2025. The central claim about Iranian rebuilding was not independently verified. And the military buildup created exactly the kind of commitment trap that strategic theorists have long warned about.

Whether that buildup was designed to support diplomacy or to close it off is a question the declassified record may eventually answer. Whether those two functions are even separable in coercive diplomacy is another question it may resolve. What the public record already shows is that the buildup created pressure toward military action that the diplomatic track did not resolve. The full diplomatic record, whenever it becomes available, will be worth reading carefully.

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