The United States has revived a naval blockade strategy first threatened during President Donald Trump’s earlier administration, now actively interdicting Iranian oil shipments as part of a renewed maximum-pressure campaign. This escalation marks the latest chapter in a bilateral relationship that has defined U.S. Middle East policy for more than seven decades, with roots stretching back to a covert operation that overthrew Iran’s democratically elected government in 1953.
Seven Decades of Mistrust and Retaliation
The current confrontation is the product of a long and bitter history. In 1953, the CIA and Britain’s MI6 orchestrated the coup that removed Prime Minister Mohammad Mossadegh after he nationalized Iran’s oil industry, which had long been controlled by a British corporation.
The operation restored the monarchy of Mohammad Reza Pahlavi, setting Iran on a path of authoritarian rule backed by the United States. That intervention remains a foundational grievance for Iran’s leadership, coloring how Tehran interprets every American move. Popular resentment against the shah’s regime and U.S. support for it culminated in the 1979 Iranian Revolution, which installed an anti-American theocracy. During the revolution, militants seized the U.S. embassy in Tehran and held 52 American diplomats hostage for 444 days.
The United States broke diplomatic relations in April 1980, a rupture that has never fully healed. During the Iran-Iraq War (1980-1988), Washington supported Iraq, deepening the divide.
In 2015, the United States joined with the UK, France, Germany, Russia, China, and Iran to sign the Joint Comprehensive Plan of Action (JCPOA), a landmark deal that limited Iran’s uranium enrichment in exchange for sanctions relief. President Trump withdrew the United States from the agreement in 2018 and reimposed economic sanctions. Iran responded by violating the deal’s limits, enriching uranium to 4.5 percent in 2019 and later to 60 percent by 2024—a level approaching weapons-grade material.
A U.S. drone strike in 2020 killed Iranian General Qasem Soleimani. In 2023 and 2024, Iran seized several oil tankers in the Persian Gulf, including the Advantage Sweet in April 2023 and the St Nikolas in January 2024.
Restarting a Policy That Was Never Implemented
The new blockade announcement is a policy restart: President Trump first threatened such a measure during his administration, but it was never fully implemented at the time. Now, the United States is actively stopping Iranian oil from reaching international buyers, aiming to choke off a key revenue stream for Tehran. The strategy mirrors the “maximum pressure” campaign of Trump’s first term, effectively setting up a checkpoint on a major shipping lane with consequences for global energy markets.
The practical implications extend beyond diplomacy. Iran has already demonstrated it will retaliate by seizing vessels of its own.
The Advantage Sweet and St Nikolas incidents are concrete examples of how a shipping dispute can escalate into a direct confrontation at sea. For global markets, potential disruptions to oil supply could affect prices at the pump, though that outcome is not guaranteed. The blockade also tests whether Iran will respond with further tanker seizures or advance its nuclear program even further. Tehran has already enriched uranium to 60 percent, a level that brings it close to weapons-grade material.
The blockade could push it further.
What the History Means for the Present
Understanding the 1953 coup explains why trust between Washington and Tehran is so thin. For Iran’s leadership, that event was a deep betrayal of national sovereignty.
It fueled the 1979 revolution and underpins the anti-American stance of the current regime. Every American move in the region is viewed through that lens. The current blockade is the latest in a cycle of retaliation stretching back generations: the United States backed Iraq in the 1980s, withdrew from the nuclear deal in 2018, killed a top Iranian commander in 2020, and now has drawn a line in the water.
For ordinary readers, this is not just a diplomatic spat. The coming weeks will reveal whether Iran responds with further tanker seizures or escalates its nuclear program.
The United States has drawn a line in the water, and Iran has a long history of crossing such lines. The stakes involve global energy markets, maritime security in the Persian Gulf, and the stability of the broader region.
