From the 2015 Joint Comprehensive Plan of Action (JCPOA) to the current standoff, U.S.-Iran nuclear negotiations have been full of diplomatic breakthroughs and policy reversals that have influenced Middle Eastern geopolitics for over a decade. These complex negotiations continue to evolve with implications for both regional and international security.
Birth of the JCPOA (2013-2015)
The Obama administration’s diplomatic outreach laid the foundation for modern U.S.-Iran nuclear diplomacy. After years of escalating tensions and crippling sanctions, secret talks began in 2013 between U.S. and Iranian officials, setting the stage for what some would call one of the most significant diplomatic achievements of the 21st century.
The Joint Comprehensive Plan of Action (JCPOA) was finalized in Vienna on July 14, 2015, between Iran and the P5+1 (the five permanent members of the UN Security Council—China, France, Russia, the UK and the U.S.—plus Germany) together with the European Union. Under its terms, Iran agreed to dismantle a large part of its nuclear program and open nuclear facilities to international inspections in exchange for billions of dollars worth of sanctions relief. While proponents argued that the deal effectively stopped nuclear weapon development, critics reasoned that allowing Iran any nuclear enrichment gave them a quick path to a bomb whenever they deemed fit. October 18, 2015, marked Adoption Day of the JCPOA, when the agreement came into effect, and participants began taking steps to implement their commitments. On January 16, 2016, Implementation Day, the International Atomic Energy Agency (IAEA) verified Iran’s compliance with key nuclear restrictions.
Trump’s Withdrawal (2018)
After campaigning on the idea that the JCPOA was “the worst deal ever negotiated,” Trump announced that the United States would withdraw from the plan on May 8, 2018. President Trump’s decision sent shockwaves through the international community and signified the beginning of a new era of maximum pressure on Iran. The campaign destroyed the Iranian economy but failed to force Iran to abandon its nuclear ambitions. Instead of capitulating, Iran began systematically reducing its compliance with the JCPOA’s nuclear restrictions, gradually rebuilding its uranium stockpiles and advancing its enrichment capabilities.
Biden’s Attempted Revival (2021-2024)
When President Biden took office in January 2021, he inherited a nuclear crisis. Over the past four years, Iran significantly expanded its nuclear program beyond JCPOA limits. In an ambitious effort, the Biden administration attempted to revive the nuclear deal through indirect talks in Vienna. Initially, top diplomats reported progress; however, the eighth round of talks adjourned in January 2022 amid what European diplomats called “the final stage” in negotiations. However, major points of contention remained unresolved. The administration’s efforts failed due to a number of factors, likely including Iran’s domestic political upheaval following widespread protests, the country’s support for Russia in the Ukraine war, and fundamental disagreements over sanctions relief and nuclear restrictions.
The Biden administration faced criticism over its sanctions enforcement approach during diplomatic efforts. The administration repeatedly extended sanction waivers allowing Iran access to over $10 billion in frozen funds, with officials stating the money could only be used for “humanitarian” goods. Critics argued that “billions here… free up billions elsewhere for the world’s leading sponsor of terrorism.” Additionally, sanction enforcement became a challenge in cases like that of Mahan Air, an airline used by the Iranian regime to transport military assets to the Assad regime, which continued acquiring aircrafts through intermediaries despite being sanctioned for weapons transport. Analysts noted that “sanctions without enforcement are easy to circumvent.” Between 2021 and 2024, Iran increased its uranium stockpiles and restricted inspector access, prompting U.S. officials to express “serious concerns” about Iran beginning work on nuclear weaponization. Meanwhile, the U.S. continued to provide sanctions relief through various waivers. Additionally, the U.S. discouraged allies from censuring Iran at an International Atomic Energy Agency meeting in 2024 and said they would not support an Israeli strike on Iranian nuclear sites.
Trump’s Return (2025)
The return of Donald Trump to the presidency in January 2025 initially marked a notable departure from the hardline stance that defined his first term, particularly in regard to Iran. Rather than reinstating the “maximum pressure” campaign that once dominated U.S. policy, Trump 2.0 initially opted for a more surprising strategy: direct diplomatic engagement. This pivot culminated in indirect U.S.-Iran talks in Oman, which achieved their primary aim: reviving a diplomatic pathway. These meetings, the first since the U.S. withdrew from the 2015 nuclear deal, seemed to signal a recognition from Trump that military pressure alone failed to produce the desired outcomes.
However, the diplomatic optimism of early 2025 quickly unraveled into a deepening crisis. Trump set a 60-day deadline for Iran deal negotiations to succeed in a letter to Iran’s Supreme Leader Ayatollah Ali Khamenei. The clock began when talks started on April 12. Tensions sharply escalated as negotiations teetered on the edge of collapse. Iran’s Supreme Leader adopted a defiant posture, rejecting American proposals and accusing the U.S. of seeking to dismantle Iran’s nuclear autonomy.
Meanwhile, controversial U.S. proposals suggested Washington could invest in Iran’s civilian nuclear infrastructure, but these offers lacked cohesion. President Trump contradicted these proposals publicly by stating, “Under our potential Agreement — WE WILL NOT ALLOW ANY ENRICHMENT OF URANIUM.” Iranian officials dismissed the proposals as “incoherent and disjointed, very unrealistic, and with excessive demands.”
As diplomacy stalled, military preparations intensified on both sides. Intelligence revealed that Iran was importing thousands of tons of ballistic missile components from China, while the U.S. evacuated non-essential personnel from embassies in Iraq, Bahrain, and Kuwait. Iran expanded its uranium enrichment operations, and the UN’s nuclear watchdog declared Iran in non-compliance for the first time in 20 years.
June 13, 2025: Israel Strikes Iran
The diplomatic crisis reached its breaking point on June 13, 2025, when Israel launched an unprecedented attack on Iran’s nuclear program and military leadership. The massive operation, dubbed “Operation Rising Lion,” involved 200 fighter jets striking over 100 targets across Iran, including the main enrichment facility in Natanz, nuclear scientists, and what Netanyahu called “the heart of Iran’s ballistic missiles program.”
The strikes killed several of Iran’s most powerful military figures, including Gen. Hossein Salami, commander-in-chief of Iran’s Revolutionary Guard, and Maj. Gen. Mohammad Bagheri: Iran’s highest-ranking military officer. The IRGC’s Air Force commander, Amir Ali Hajizadeh, was also eliminated in a strike on an underground command center. Unlike Iran’s regular army, which is tasked with defending the nation’s borders, the Revolutionary Guard operates independently and focuses on safeguarding the Islamic regime, wielding significant influence both domestically and across the region. Six nuclear scientists were killed in the operation, dealing a devastating blow to Iran’s nuclear program.
President Trump, whose 60-day deadline had expired the day before, told CNN that the U.S. “of course” supports Israel and called the strikes “a very successful attack.” He warned Iran to “come to the table to make a deal before it’s too late,” adding that “the people [he] was dealing with are dead, the hardliners.” Trump knew about Israel’s plans, stating, “It wasn’t a heads-up. It was, we know what’s going on.”
The attack is the largest strike on Iran since the Iran-Iraq war of the 1980s and pushed the Middle East into dangerous new territory. Iran suspended all domestic and international flights and launched over 100 drones in retaliation, most of which were intercepted by Israeli defenses. Supreme Leader Khamenei warned that Israel “should expect severe punishment,” while crowds gathered in Tehran calling for retaliation.
Conclusion: The End of Nuclear Diplomacy
The consequences of this military escalation stretch far beyond Iran and Israel. The collapse of diplomacy and the outbreak of direct military conflict risks sparking a broader regional war, disrupting global energy markets, and unleashing a new wave of nuclear proliferation in one of the world’s most unstable regions. Oil prices surged over 8% following the attacks, with analysts warning of potential $100 oil if attacks affect the Strait of Hormuz.
The pattern from the hope of the 2015 JCPOA to today’s military confrontation represents the complete crumble of nuclear diplomacy. The world now faces the very conflict that years of negotiations sought to prevent. The cycle of breakthroughs followed by breakdowns has finally reached its ultimate conclusion, and the art of the deal has given way to the reality of war.
