When the E3 – the United Kingdom, France, and Germany – notified the United Nations in late August that Iran was in breach of its obligations under the 2015 Joint Comprehensive Plan of Action (JCPOA), the move marked the final blow to an agreement that once stood as a model of diplomatic compromise. The “snapback” mechanism, triggered a month later, automatically reinstated a wide array of international sanctions against Iran for its “persistent and significant nonperformance” of its nuclear commitments. It was a moment that symbolized not only the end of the JCPOA but also the collapse of a decade of diplomatic investment aimed at containing Iran’s nuclear ambitions through engagement rather than confrontation.

Yet, despite the reimposition of sanctions and the unified stance of Western powers, few analysts genuinely believe that economic pressure alone will force Tehran to reverse its nuclear trajectory. The historical record is clear: sanctions may isolate and weaken regimes, but they rarely compel them to surrender what they consider vital national interests. In Iran’s case, its nuclear program has long been tied not just to security calculations but also to political legitimacy and national pride.

The demise of the JCPOA was, in many ways, long foretold. When US President Donald Trump withdrew unilaterally from the accord in 2018 – heavily influenced by Israeli Prime Minister Benjamin Netanyahu – he did more than simply dismantle a piece of Obama-era diplomacy. He set in motion a chain reaction that destroyed the fragile balance of trust on which the agreement depended. From that moment on, the JCPOA was effectively on life support.

The E3’s recent invocation of the snapback clause merely formalized what was already true: the agreement is dead. What remains is a landscape of heightened suspicion, dwindling diplomatic options, and an increasingly emboldened Tehran that sees nuclear capability as its ultimate insurance policy.

Ironically, the urgency to activate the snapback mechanism did not arise from any dramatic new evidence that Iran was racing toward a nuclear weapon. Rather, it was driven by the JCPOA’s own architecture. Under its “sunset” clause, several key restrictions on Iran’s nuclear activities were set to expire by October 2025. The hope back in 2015 was that a decade of compliance would build enough confidence for Iran to be treated as a normal member of the international community. Instead, the sunset clause became a countdown to collapse.

When Hassan Rouhani signed the JCPOA, he presented it to the Iranian public as a pragmatic deal – one that traded short-term constraints for long-term normalization. For the West, it was a transactional agreement that could evolve into something transformational, reshaping Iran’s relationship with the world.

But that transformation never materialized. Neither side managed to move beyond transactional diplomacy. Iran accused Washington and Europe of failing to deliver on promises of sanctions relief and economic normalization, while Western governments accused Tehran of exploiting loopholes and continuing destabilizing activities in the region. The mutual mistrust that the JCPOA was supposed to dissolve only deepened.

Negotiations that might have produced a successor agreement were repeatedly postponed, as both sides were consumed by domestic politics – in Washington, by the tumult of the Trump years and subsequent realignment under President Biden; in Tehran, by the ascendance of hard-liners who saw the deal as a trap rather than a triumph.

By the time the E3 reimposed sanctions in September, the clock had run out. The JCPOA expired in all but name, and diplomacy was again replaced by pressure.

The reimposition of sanctions also came in the aftermath of the June war between Israel and Iran – a brief but intense conflict that revealed Tehran’s military and security vulnerabilities. Israeli and US strikes reportedly inflicted serious damage on several nuclear sites, including facilities housing uranium enriched to near weapons-grade levels. While both Washington and Tel Aviv claim the war set back Iran’s nuclear program by years, no independent verification has substantiated these claims.

More troubling is the question of Iran’s remaining stockpile of enriched uranium – around 408 kilograms – much of it potentially hidden or buried beneath the rubble of destroyed facilities. The International Atomic Energy Agency (IAEA) has not been granted access to confirm the material’s status, and Tehran’s refusal to cooperate further suggests a hardening position rather than compliance.

For all practical purposes, the JCPOA’s collapse has left the world with no binding mechanism to monitor or restrain Iran’s nuclear program. Before the US withdrawal, the agreement ensured strict oversight, including intrusive inspections and limitations on uranium enrichment. Since then, enrichment has accelerated, and Iran now possesses both the technical expertise and material stockpiles necessary to reach weapons-grade capability if it so chooses.

This development has prompted renewed debate in Washington and Tel Aviv about preemptive options. With Iran’s air defenses weakened after the June war, some Israeli strategists argue that a follow-up strike could permanently cripple its nuclear infrastructure. Such calculations are dangerous – and potentially catastrophic – but they underscore the growing sense of inevitability surrounding the conflict.

At the same time, the weakening of Iran’s regional allies – including Hamas, Hezbollah, and the collapse of the Assad regime in Syria – has further isolated Tehran. Yet paradoxically, this isolation has only strengthened the position of Iran’s hard-liners, who argue that the country’s survival depends on accelerating its nuclear program as a deterrent.

Despite these grim dynamics, escalation is not inevitable. The return to sanctions, while politically convenient for the West, is no substitute for a durable strategy. Decades of punitive measures have shown that economic isolation tends to consolidate, not weaken, the grip of Iran’s Revolutionary Guards over the economy. The real victims are the Iranian people, whose daily lives are increasingly defined by inflation, shortages, and despair.

A new diplomatic framework is therefore essential. Such an agreement would need to go beyond the JCPOA’s limited scope and address the broader security architecture of the region – including missile programs, proxy conflicts, and mutual recognition of legitimate defense concerns. It would also require a new inspection regime that is both rigorous and credible, ensuring transparency without infringing on Iran’s sovereignty.

Ultimately, neither side can afford perpetual confrontation. For the West, an unrestrained Iranian nuclear program poses an existential threat to the nonproliferation regime and regional stability. For Iran, continued isolation means economic stagnation and the risk of catastrophic conflict.

The collapse of the JCPOA is a diplomatic tragedy, but it does not have to be the final word. The lesson of the past decade is clear: coercion alone cannot achieve what diplomacy once promised. The challenge now is to resurrect not the same agreement, but the same spirit of negotiation that made it possible. Only through dialogue – however difficult or protracted – can the world hope to prevent the return of another Middle Eastern nuclear crisis.

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Source: Weekly Blitz :: Writings