TEHRAN, July 11 — The scene across the Iranian capital this week is one of hardened resolve and open defiance. On the streets, residents describe a familiar rhythm of economic strain, but the political temperature has shifted decisively since the United States formally withdrew from the 2015 nuclear deal. By nightfall, state television broadcasts repeated warnings that Iran’s nuclear program is no longer bound by the restrictions Washington itself abandoned.
President Donald Trump announced the U.S. withdrawal from the Joint Comprehensive Plan of Action on May 8, 2018, pulling out of the landmark accord between Iran and the P5+1 — the United States, United Kingdom, France, Russia, China, and Germany. The decision dismantled the core diplomatic achievement of the Obama era and set in motion a cascade of retaliatory moves that have brought the region to the edge of a new confrontation.
The reimposition of American sanctions came in two deliberate phases. On August 6, 2018, the U.S. Treasury targeted Iran’s financial transactions and automotive imports. Then on November 5, 2018, the hammer fell on Iran’s oil exports and banking sector.
The sanctions were designed to choke off the revenue streams that Washington argued Tehran used to fund proxy militias and destabilize the Middle East. Iran’s response was not long in coming.
By July 1, 2019, Tehran had crossed the first major red line set by the JCPOA, surpassing the agreement’s limits on uranium enrichment. The move was a direct challenge to the remaining signatories — the European powers, Russia, and China — who had struggled to preserve the deal’s economic benefits for Iran in the face of American pressure. On the water, the crisis took a more dangerous turn.
The June 13, 2019, tanker attacks near the Strait of Hormuz sent a shudder through global oil markets. The strait, a narrow chokepoint through which a significant portion of the world’s seaborne crude passes, became the flashpoint for a shadow war of sabotage and retaliation. Iran has previously threatened to close the strait in response to sanctions, including in 2012 and again in 2018.
Those threats, once dismissed as rhetoric, now carry the weight of demonstrated capability.
A region on edge
The U.S. military posture shifted in parallel. In May 2019, the Pentagon deployed an aircraft carrier strike group to the region, a show of force intended to signal that Washington would not tolerate disruptions to free navigation. The deployment raised the stakes dramatically: any miscalculation in the crowded waters of the Gulf could spiral into a direct military engagement between American and Iranian forces.
For Iran’s leadership, the calculus is clear. The JCPOA, which they negotiated in good faith with the P5+1, is now effectively dead from their perspective.
The deal had offered Tehran relief from crippling economic sanctions in exchange for verifiable limits on its nuclear program. With the United States not only out of the agreement but actively reimposing the toughest sanctions regime in a generation, the regime’s hardliners have gained the upper hand in the internal debate over whether to pursue a nuclear weapon capability. The European signatories — Britain, France, and Germany — have scrambled to create a financial mechanism that would allow Iran to continue trading without falling afoul of American sanctions.
But those efforts have been largely symbolic. The sheer weight of the U.S. financial system and the dominance of the dollar in global trade mean that most major companies have chosen to exit the Iranian market rather than risk losing access to the United States.
The Strait of Hormuz chokepoint
The June 2019 tanker attacks underscored just how fragile the situation remains. The attacks occurred near the Strait of Hormuz, a waterway that connects the Persian Gulf to the open ocean. Iran has long viewed the strait as its strategic trump card — a lever it can pull to inflict pain on the global economy if its own exports are blocked.
The 2012 threat to close the strait came during a previous round of sanctions, and the 2018 threat was renewed almost immediately after Trump’s withdrawal announcement. By nightfall in Tehran, the streets are quieter, but the tension is palpable.
The Iranian rial has lost significant value against the dollar since the sanctions were reimposed, and prices for basic goods have climbed. Yet the regime’s survival depends on projecting strength, not weakness. The enrichment violations and the threats against the strait are messages to Washington: Iran can make the cost of leaving the deal far higher than the cost of staying in it.
The United States, for its part, has shown no willingness to return to the negotiating table. The Trump administration’s stated policy is one of maximum pressure, aimed at forcing Iran to accept a new agreement that would address not only its nuclear program but also its ballistic missile development and support for armed groups across the region.
Iran has rejected those preconditions outright.
What to watch next
The next flashpoint could come at any moment. Iran’s enrichment levels are creeping upward, and inspectors from the International Atomic Energy Agency have reported that Tehran is now stockpiling low-enriched uranium well beyond the JCPOA’s limits. The tanker attacks in June remain unresolved, with the United States blaming Iran and Iran denying involvement.
The aircraft carrier strike group remains on station in the Arabian Sea.
