What Happened
- As the US-Israel military campaign against Iran intensified from February 28, 2026, analysis of the deep historical rupture between Washington and Tehran became critical context for understanding the conflict.
- The bilateral relationship transformed over seven decades from a close Cold War alliance — under which the US sponsored a 1953 coup to reinstall the Shah — to strategic adversaries following the 1979 Islamic Revolution.
- The 2015 nuclear deal (JCPOA) represented the most significant attempt at rapprochement; Donald Trump's 2018 withdrawal and "maximum pressure" policy reversed that trajectory.
- Iran's nuclear programme has advanced to 60% uranium enrichment levels (near weapons grade), and Tehran has refused to re-enter the JCPOA framework on US terms.
- The 2026 war — triggered by a joint US-Israel strike on Iranian military infrastructure on February 28 — represents the most severe military escalation in the history of the bilateral relationship.
Static Topic Bridges
The 1953 Iran Coup and Cold War Context
The roots of Iranian grievance toward the United States trace directly to Operation Ajax (1953), a CIA- and British MI6-sponsored coup that overthrew the democratically elected Prime Minister Mohammad Mosaddegh. Mosaddegh had nationalised the Anglo-Iranian Oil Company (now BP); Western powers feared this would set a precedent for resource nationalism across the developing world.
- Shah Mohammad Reza Pahlavi was reinstalled following the coup and became a key US security partner through the Cold War.
- Under the Eisenhower administration's "Atoms for Peace" programme (1957), the US provided Iran with nuclear technology — the institutional foundation for what later became Iran's nuclear programme.
- Iran's position astride the Soviet border made it a "pillar" of US Middle East strategy under the Nixon Doctrine (1969), which relied on regional surrogates for security.
- The Shah's authoritarian SAVAK secret police — widely seen as US-backed — generated deep popular resentment that fuelled the 1979 Revolution.
Connection to this news: Understanding the 1953 coup is essential to understanding why the 1979 Revolution was framed as an anti-American liberation and why Iran's governing ideology — Velayat-e Faqih (rule of the jurist) — defined itself in explicit opposition to American influence.
The 1979 Revolution and Hostage Crisis: A Diplomatic Rupture That Never Healed
The Islamic Revolution of February 1979 replaced the Shah's monarchy with a theocratic republic under Ayatollah Ruhollah Khomeini. On November 4, 1979, revolutionary students stormed the US Embassy in Tehran and held 52 American diplomats and citizens hostage for 444 days — from November 4, 1979 to January 20, 1981.
- The hostage crisis led to the severing of US-Iran diplomatic relations, which have never been restored; the US has had no embassy in Tehran since 1980.
- The US imposed comprehensive economic sanctions on Iran beginning in 1979 under the International Emergency Economic Powers Act (IEEPA).
- Iran-Contra Affair (1986-87): The Reagan administration secretly sold weapons to Iran — despite an arms embargo — and used proceeds to fund Nicaraguan Contras, revealing the contradictory nature of US-Iran relations even in the adversarial period.
- In 1983, the Hezbollah bombing of a US Marine barracks in Beirut killed 241 personnel; the US attributed Hezbollah's creation and funding to Iran, leading President Reagan to designate Iran a "State Sponsor of Terrorism" — a designation still in place.
Connection to this news: The 46-year absence of diplomatic relations means that every US-Iran interaction occurs through intermediaries (Qatar, Oman, Switzerland) or hostile channels, making de-escalation structurally difficult even when politically desired.
The JCPOA and Nuclear Diplomacy: Rise and Collapse
The Joint Comprehensive Plan of Action (JCPOA), signed on July 14, 2015, represented the most significant diplomatic achievement between the US and Iran in the post-revolutionary period. It was negotiated by the P5+1 (US, UK, France, China, Russia, Germany) plus the EU.
- Under the JCPOA, Iran agreed to: reduce its centrifuge count, cap uranium enrichment at 3.67%, reduce stockpile of enriched uranium by 98%, dismantle the Arak heavy-water reactor, and accept IAEA monitoring.
- In exchange, the US and EU lifted nuclear-related sanctions worth approximately $100 billion in frozen assets and allowed Iran to re-enter global oil markets.
- President Trump withdrew the US from JCPOA on May 8, 2018, calling it "the worst deal ever" and reinstated and expanded sanctions under a "maximum pressure" campaign.
- Iran responded by progressively exceeding JCPOA limits: by 2023 it had enriched uranium to 60% purity (weapons-grade requires 90%); IAEA verified Iran had sufficient material for multiple nuclear devices.
- The Biden administration's 2021-2022 attempts to revive the deal failed over disputes on IRGC designation and the scope of sanctions relief.
Connection to this news: The collapse of nuclear diplomacy and Iran's accelerating enrichment programme created the conditions under which an Israeli-American military operation became thinkable — the argument that Iran was approaching "threshold" nuclear capability drove the February 28, 2026 strikes.
Iran's Role in the "Axis of Resistance" — A New Security Architecture
Iran's strategic response to US pressure has been the construction of what it calls the "Axis of Resistance" — a network of state and non-state actors across the Middle East aligned with Tehran's security interests and ideologically linked through Shia Islam and anti-Americanism/anti-Zionism.
- Core components: Hezbollah (Lebanon), Hamas (Gaza), Palestinian Islamic Jihad, Houthi movement (Yemen), Iraqi Shia militias (Popular Mobilisation Forces/PMF), and Syrian government forces.
- Iran's Islamic Revolutionary Guard Corps (IRGC) — designated a Foreign Terrorist Organization by the US since 2019 — coordinates military, financial, and intelligence support to Axis partners.
- The network allows Iran to project power across the Middle East without direct military confrontation, practicing "strategic depth through proxies."
- The IRGC Quds Force (extraterritorial operations arm) has operated in Iraq, Syria, Lebanon, Yemen, and Gaza.
Connection to this news: The 2026 war represents the collapse of the proxy model — the US and Israel have moved to directly strike Iranian territory and naval assets, fundamentally changing the strategic calculus Tehran built over four decades.
Key Facts & Data
- US-Iran diplomatic relations severed: April 7, 1980 (following the hostage crisis) — no restoration in 46 years.
- JCPOA signed: July 14, 2015; US withdrawal: May 8, 2018.
- Iran's uranium enrichment level as of 2023-24: 60% purity (weapons grade = 90%).
- US State Sponsor of Terrorism designation: 1984 (Reagan administration) — still in place.
- Iran's oil exports before 2018 sanctions: approximately 2.5 million barrels/day; reduced to under 500,000 b/d after "maximum pressure."
- Supreme Leader Ayatollah Ali Khamenei passed away during the 2026 conflict (confirmed by Chinese MFA condolences, March 6, 2026).
- 1979 hostage crisis: 52 Americans held for 444 days (November 4, 1979 — January 20, 1981).