The nuclear accord with Iran, formally the Joint Comprehensive Plan of Action, remains one of the most contentious legacies of modern American foreign policy. Concluded in 2015 under the Obama administration, it sought to cap Iran’s uranium enrichment in exchange for sanctions relief. The Trump administration’s withdrawal in 2018 and subsequent “maximum pressure” campaign represented a stark departure. A dispassionate assessment of both approaches reveals strategic miscalculations on each side.
Obama’s calculus was rooted in containment and verification. The JCPOA imposed rigorous International Atomic Energy Agency inspections, reduced Iran’s enriched uranium stockpile by 98 per cent, and limited enrichment to 3.67 per cent. For the duration of the deal, Iran was effectively blocked from racing toward a weapon. Critics, however, pointed to sunset clauses that would allow Iran to resume enrichment after 2030, and the deal’s silence on Iran’s ballistic missile programme and regional proxies. The Obama approach underestimated the durability of the agreement without bipartisan support in Washington. Iran also benefited from sanctions relief without fully altering its destabilising behaviour in Syria, Yemen, and Lebanon.
Trump’s withdrawal and reimposition of sanctions were designed to force Iran into a more comprehensive negotiation covering missiles and proxy forces. The strategy succeeded in crippling Iran’s economy, reducing oil exports by more than 80 per cent, and driving inflation above 40 per cent. But it failed to deliver a new deal. Instead, Iran accelerated its nuclear programme, enriching uranium to 60 per cent purity and installing advanced centrifuges. The “maximum pressure” campaign also isolated the United States, drawing criticism from European allies who remained party to the JCPOA. By dismantling a functioning verification regime without a viable alternative, the Trump administration created a vacuum that Iran exploited.
Where Obama was right was in securing an internationally verifiable break-out time of at least one year. Where he was wrong was in assuming economic incentives would moderate Iran’s behaviour. The JCPOA was a non-proliferation tool, not a device for comprehensive containment.
Where Trump was right was in recognising the deal’s limitations, particularly its temporality and neglect of missiles and proxies. Where he was wrong was in believing unilateral sanctions alone could compel Iranian capitulation. Iran’s leadership, under Ali Khamenei, proved resilient, using defiance to consolidate domestic support.
The net strategic effect has been negative. Iran now possesses a vast nuclear knowledge base and is weeks away from weapon-grade material. The United States faces a dilemma: accepting a nuclear Iran or pursuing military options that risk regional war. Neither Obama’s diplomacy nor Trump’s coercion achieved the primary objective of permanently blocking Iran’s path to a bomb.
A more effective approach would blend verified limits, rigorous inspections, and pressure on Iran’s regional activities while maintaining allied cohesion. The lesson for Washington is that nuclear non-proliferation requires consistency, multilateral buy-in, and a willingness to enforce consequences for violations. Without that, any strategy risks being outflanked by Iran’s strategic patience.
