US unveils ‘economic D-Day’ sanctions against Iran

The United States is set to unveil what Treasury Secretary Scott Bessent called "the single greatest financial offensive ever marshaled against an adversary" on Monday, escalating Washington's economic campaign against Iran as the two sides' 60-day ceasefire window closed without a deal.

Bessent's Declaration and Iran's Response

In a post on X late Sunday, Bessent declared that "at dawn begins an economic D-Day," framing the measures as the "endgame" of the Trump administration's pressure campaign against Tehran. He said President Trump had "dismantled Iran's military capabilities, destroyed nearly 100 percent of its military factories, and buried its nuclear program," and that Washington would now "sever every economic lifeline that sustains the tyrannical regime until Tehran stands alone."cnbc+1

Bessent, who is scheduled to hold a press conference Monday afternoon, also warned foreign governments still transacting with Iran: "Any nation that serves as a financial artery of a withering regime should expect to share in its isolation."cnbc

Iran's Deputy Foreign Minister Kazem Gharibabadi dismissed the announcement in a post on X, calling it an "admission of America's defeat" and questioning why Washington needed "the largest financial invasion in history" against a country whose military it claims to have already destroyed. Iranian Foreign Ministry spokesperson Esmaeil Baghaei said Monday that repeated sanctions have "failed" and that Iran would use all its "bilateral capabilities" to confront the new measures.tribune

Hormuz Tensions and Shipping Risks

Simultaneously, Iran tightened its grip on the Strait of Hormuz, through which roughly a fifth of the world's seaborne oil once transited. Iran's Persian Gulf Strait Authority warned on X Sunday that vessels violating its transit protocols face "fines, detention, or confiscation," while Iran blacklisted 46 Western-linked ships over alleged transit breaches. Iran's parliament also approved a provision requiring ships transiting the chokepoint to pay for services provided by Tehran.lloydslist+1

Mohsen Rezaei, secretary of Iran's Supreme National Security Council, warned Saturday that "any country that becomes a partner in creating economic restrictions against us will be regarded by us as an enemy."cnbc

Global Ripple Effects

China's foreign ministry said Monday that Beijing would "closely watch developments and do what is necessary to protect its rights," while urging all parties to act with restraint. Oil prices fell in Asian trading Monday despite the escalation, with both Brent crude and West Texas Intermediate dropping more than 1% as investors appeared to take profits.tribune+1

Iran's riyal hit a historic low of around 2 million per dollar on the unregulated market Monday, down 4.5% since Trump announced the campaign last week. Morgan Stanley ↗ 0.36% analysts noted that crude supply is "tightening" with Middle East exports back at March and April levels.tribune