Treasury Secretary Scott Bessent vowed to launch what he called the "single greatest financial offensive ever" against Iran, a sweeping sanctions campaign that threatens any nation still doing business with Tehran.
Bessent laid out the threat in a Financial Times op-ed published Sunday, framing the new economic pressure campaign in wartime language and warning that countries propping up Iran's economy face isolation from global capital markets. The op-ed came after a memorandum of understanding between the U.S. and Iran, reached in June, collapsed last month, and as Tehran's own leadership appeared divided over how to respond.
The message from the Treasury Department was blunt: the era of nations quietly buying Iranian petroleum, facilitating seaborne fuel transfers, and laundering money through Iranian banks while hiding the scale of their involvement is over. Countries that sever economic ties with Tehran, Bessent wrote, will gain deeper access to global capital. Countries that don't will face consequences.
The Treasury Secretary opened his op-ed with language designed to leave no ambiguity about the administration's intent. Bessent wrote:
"At dawn begins an economic D-Day, the single greatest financial offensive ever marshalled against an adversary."
He pointed to what he described as already severe damage to Iran's economy, asserting that President Trump had weakened the Iranian rial to historic lows and pushed inflation to levels rarely seen. No specific figures accompanied those claims, but Iran's currency did hit a record low following the announcement, Breitbart reported.
Bessent reserved particular contempt for countries he accused of enabling the Iranian regime. Without naming specific nations, he described governments that "turn a blind eye to seaborne fuel transfers and the illicit use of their banks, all while concealing the extent of their complicity." Those countries, he argued, had calculated that appeasing Tehran was safer than confronting it.
"In short, these countries calculate appeasement of the regime to be the safer course. But they would do well to consider the consequences of sustaining it."
The carrot-and-stick framing was deliberate. Bessent promised that nations cutting ties with Iran would "deepen their access to global capital, reinforce confidence in their markets and attain the standing they seek in the world economy." The alternative, he wrote, was stark: "The alternative for those who tether themselves to Tehran is the foreclosure of any path to lasting prosperity."
And for Tehran itself, the warning carried a military edge. Bessent stated that Trump would "respond swiftly and decisively" if Iran answered the economic campaign with military force. The U.S. military has already been escorting oil shipments through the Strait of Hormuz amid ongoing Iranian threats to commercial shipping in the region.
The sanctions are not a single action but a phased campaign. The Washington Examiner reported that the Treasury Department plans to issue sanctions in waves, giving non-targeted countries a window to sever their economic ties with Iran before penalties hit. U.S. officials have already mapped Iran's oil-smuggling and sanctions-evasion networks to maximize the impact of each round.
Fox News reported that the sanctions target five specific economic sectors: digital assets, technology, gold, aviation, and shipping. Bessent described the measures as "economic asphyxiation of this regime" and warned that secondary sanctions risk now extends to any foreign entity conducting business with Iran.
The scope of the campaign signals that the administration views economic pressure, not additional military escalation, as the primary tool for forcing Tehran back to negotiations. The U.S. has already destroyed what officials described as nearly 100 percent of Iran's military factories and dismantled its nuclear program, according to the New York Post. With the military dimension largely accomplished, the financial campaign aims to choke off the revenue that keeps the regime functioning.
Bessent framed the broader objective in unsparing terms: "The world should understand that our objective is to sever every economic lifeline that sustains the tyrannical regime until Tehran stands alone."
Tehran's response arrived before Bessent's op-ed hit print. On Saturday, Mohsen Rezaei, described as Iran's security chief, gave an interview to Iranian state media in which he threatened direct retaliation against any neighboring country that cooperates with the American economic campaign.
"If countries neighboring Iran cooperate with the Americans in the economic war, we will target their interests."
Rezaei went further, threatening to halt all oil shipments through the Persian Gulf, a waterway through which roughly one-fifth of the world's oil and gas passes. "If they start such an action, we will not allow a single drop of oil to pass through the Persian Gulf," he said. Iran has previously issued demands to the United States as conditions for reopening the Strait of Hormuz, and the regime's military leadership has escalated its rhetoric repeatedly during the conflict.
Rezaei also dismissed the American pressure campaign as hollow posturing. "The world has realized that Trump's bluster is nothing but empty talk," he said. Iran's broader position, according to Breitbart, is that any foreign support for the new American sanctions would be treated as an "act of war."
The threat to shut down Persian Gulf oil flows is not new, but it carries real weight. Saudi Arabia and the United Arab Emirates have developed alternative export routes, sending oil through the Red Sea and the Gulf of Oman, specifically to reduce their dependence on the Strait of Hormuz. That infrastructure suggests Gulf states have been preparing for exactly the kind of confrontation Rezaei is now threatening.
The U.S. military has responded to Iranian aggression in the region with force before. Central Command struck more than 80 Iranian targets after Tehran attacked commercial ships, and the broader security posture in the Gulf reflects an administration willing to back its economic threats with military capability.
While Rezaei rattled sabers, Iranian President Masoud Pezeshkian struck a markedly different tone. Speaking on Sunday, Pezeshkian acknowledged that Iran cannot sustain its current posture indefinitely.
"One day, a decision must be made to save the country from the state of 'neither war nor peace.'"
Pezeshkian defended the memorandum of understanding Iran reached with the United States in June, the same agreement that collapsed last month. The Iranian state news agency IRNA quoted him saying, "By implementing this memorandum, we can resolve the problems with logic and dignity." Supreme Leader Mojtaba Khamenei reportedly had reservations about that agreement, which makes Pezeshkian's public defense of it a notable break from the regime's hardline consensus.
The Iranian president's language was strikingly domestic in focus. He spoke of steering "inflation, public problems, people's livelihoods, people's jobs, people's future, and people's lives towards dignity and pride." He told his audience, "We must stand with the people," and warned that even the greatest military power means nothing if the government cannot convince its citizens "that we all belong to the same land and country."
The gap between Rezaei and Pezeshkian tells its own story. One threatens to shut down global oil flows. The other talks about saving his country from a state of permanent crisis. The regime is not speaking with one voice, and that division is precisely what the Treasury Department's campaign is designed to exploit.
The security environment around the broader conflict has been intense enough that President Trump's own travel has required extraordinary precautions. Fighter jets escorted a decoy Air Force One while Trump flew a separate aircraft out of Turkey during the crisis, a measure of how seriously the administration takes the Iranian threat even as it ratchets up economic pressure.
Bessent scheduled a news conference for Monday afternoon, where the administration is expected to lay out specifics of the sanctions rollout. The op-ed set the tone; the details, which countries face immediate action, which sectors get hit first, and how aggressively the Treasury Department will enforce secondary sanctions, will determine whether the campaign lives up to its billing.
Several questions remain unanswered. The administration has not publicly identified which nations it considers Iran's primary economic enablers, nor has it specified the executive orders or legal mechanisms that will undergird the new sanctions. The cause of the June memorandum's collapse has not been explained publicly. And whether Pezeshkian's conciliatory posture reflects a genuine willingness to negotiate, or a bid for time, remains unclear.
What is clear is the scale of the administration's ambition. Bessent closed his op-ed with a line aimed squarely at any government still calculating that Tehran is a safer partner than Washington: "To become a sanctuary for terror is to become, in the eyes of the United States, a global pariah."
When a regime's own president admits his country cannot live forever between war and peace, and its security chief responds by threatening to shut down global energy markets, the case for maximum pressure makes itself.
