Blockade Pressure Mounts as Washington Rejects Tehran’s Proposal

The Islamic Republic can absorb air and missile strikes but cannot withstand economic collapse. Yet it risks such a collapse if it does not budge.

President Donald Trump rejected Tehran’s proposal on April 30 to lift the U.S. naval blockade in exchange for Iran halting its attacks on commercial vessels in the Strait of Hormuz. The offer followed the Islamic Republic’s seizure of two tankers and gunfire at another on April 22, just after Trump extended the ceasefire. Framed as deescalation, the proposal nonetheless preserved Iran’s claim of control over the Strait, as Secretary of State Marco Rubio observed.

More revealing was the scope of the offer. Rather than pursuing a comprehensive agreement tied to sanctions relief, as in its earlier proposals, Tehran is now seeking a narrower deal focused on removing the blockade while leaving the nuclear file aside. This shift shows the blockade is biting, exacerbating the regime’s economic vulnerability with existential implications.

Blockade Drives Hundreds of Millions in Daily Losses Across Key Iranian Sectors

The best way to estimate Iran’s losses from the closure of the Straits is to calculate its average daily exports. Oil provides Tehran’s primary revenue stream, with exports ranging from 1.5–2.1million barrels per day (mbpd).  Oil markets have been volatile since the war began but prices have remained in the vicinity of $100 per barrel. At that price, Tehran is losing potential revenue of $150-$210 million each day the blockade is in effect, assuming no exports.

Iran’s non-oil exports were close to $52 billion last year, or a bit less than $150 million per day. Since the blockade has less impact on non-oil exports, such as petrochemicals, metals, and natural gas, one may assume that the total has only been cut in half to a little less than $75 million per day. Together, the lost revenue from blocked oil and non-oil exports likely ranges from $225-$285 million per day.

Iran’s oil storage capacity is reportedly nearing its limit under the blockade. As exports stall, crude is accumulating in tanks and floating storage, raising the risk of forced production cuts and well shutdowns, which can cause lasting damage. Tehran has turned to measures including using aging storage infrastructure and attempting rail shipments to China, a less efficient alternative.

Economic Pressure Becomes an Existential Threat

Iran’s Supreme National Security Council has reportedly met amid mounting concern within security agencies over a renewed protest wave driven by economic grievances.  Parliamentarians are raising alarms about the regime’s inability to manage the postwar economic strain.

The facts on the ground reflect those fears. Strikes on major steel producers have taken roughly one third of national capacity offline, with cascading effects across construction, autos, and energy infrastructure. Petrochemical hubs in Asaluyeh and Mahshahr were also hit during the war, adding to job losses. The ongoing internet blackout is costing more than $35 million per day. Inflation is nearing 69 percent, the highest level recorded in Iran since World War II. These conditions are more severe than January 2026, when economic grievances ignited the largest anti-regime movement ever.

Iran Will Try To Evade but Rigorous Enforcement Will Decide the Outcome

Some Iran-linked vessels have reportedly bypassed the blockade by relying on familiar sanctions-era workarounds. However, instances of evasion do not translate into a blockade failure, as the impact of any economic pressure tool depends on enforcement scale and persistence. As of April 24, U.S. forces had redirected dozens of ships seeking to exit or enter Iranian ports, even intercepting three vessels in the Bay of Bengal near Malaysia.

Hold the Line While Pressure Peaks

For Washington, reopening the Strait of Hormuz is necessary, but treating it as the end goal risks turning leverage into a concession. Accepting a negotiated reopening now would hand the regime an off-ramp just as economic strain and internal fears are intensifying. The objective should be to sustain the blockade until that pressure forces Iran to accept dismantling its uranium enrichment capabilities, or better yet, deepens internal strain to the point of regime collapse. Anything less risks resetting the cycle rather than breaking it.

Janatan Sayeh is a research analyst at the Foundation for Defense of Democracies (FDD), where he focuses on Iranian domestic affairs and the Islamic Republic’s regional malign influence. For more analysis from the Foundation for Defense of Democracies (FDD), please subscribe HERE. Follow FDD on X @FDD and @FDD_Iran. Follow Janatan on X @JanatanSayeh. FDD is a Washington, DC-based, nonpartisan research institute focusing on national security and foreign policy.