Oil Surges Past $103 as US Naval Blockade of Iran Takes Effect
US Blockade Goes Live The United States Central Command…
US Blockade Goes Live
The United States Central Command confirmed on Monday that naval forces have begun enforcing a full maritime blockade of all traffic entering and exiting Iranian ports, effective 10:00 a.m. Eastern Time. The operation follows the collapse of US-Iran ceasefire negotiations held in Pakistan over the weekend — talks that had briefly raised hopes of de-escalation in the ongoing conflict.
President Trump ordered the blockade after diplomats failed to bridge differences on key terms. CENTCOM later clarified that the blockade targets only vessels travelling to and from Iran; other Strait of Hormuz traffic may pass unimpeded. A fragile truce between the two sides technically remains in place through April 22, though its survival is now in serious doubt.
Oil Prices React Sharply
Crude benchmarks surged on the announcement. Brent crude, the international benchmark, jumped more than 8% on Sunday to top $103 per barrel — its first time above the $100 mark since briefly touching $111 earlier in the week. WTI, the US benchmark, climbed 7.8% to around $104. Brent has now gained roughly 40% since the start of hostilities, while WTI sits more than 50% above pre-war levels.
Prices had previously peaked near $119 last month before retreating below $92 last week on hopes that the Pakistan-hosted talks would produce a ceasefire. Those hopes have now evaporated.
| Benchmark | Latest Level | Session Change | Move Since War Began |
|---|---|---|---|
| Brent Crude (Jun) | ~$103 | +8% | +40% |
| WTI (May) | ~$104 | +7.8% | +50% |
Strait of Hormuz: Shipping in Free-Fall
The narrow waterway connecting the Persian Gulf to global energy markets normally handles roughly 130 vessel transits per day, carrying approximately one-fifth of the world's oil and natural gas supply. On Saturday, just 17 vessels crossed — a collapse of over 85% from normal levels. Iran has imposed its own vetting and authorisation requirements on the limited traffic still moving through.
The plunge in transits represents what analysts are calling the largest oil supply disruption in modern history. With roughly 4% of global crude supply originating from Iran — much of it destined for China — the knock-on effects on Asian refiners and global shipping routes are significant.
Broader Market Fallout
Equity markets in Asia opened lower following the weekend announcement. Japan's Nikkei 225 fell 0.9% in early Monday trading, while South Korea's KOSPI dropped over 1%. S&P 500 futures pointed to a decline of approximately 0.8% at the US open.
The risk-off mood reflects growing concern that the blockade, rather than forcing a swift resolution, could prolong the conflict and deepen the energy crisis already weighing on the global economy.
Economic Pressure on Iran
Analysts say the blockade is designed to inflict maximum economic pain. Miad Maleki, a senior fellow at the Foundation for Defense of Democracies and former US Treasury official, estimates the blockade will cost Iran approximately $435 million per day in economic damage — roughly $13 billion per month.
Iran's economy is already showing signs of strain. The rial has declined around 8% against the dollar on the black market since the war began, and prices in Tehran and other major cities have surged an estimated 40% since hostilities commenced.
Robin Brooks, senior fellow at the Brookings Institution, argues the blockade could trigger a deeper crisis. As oil export revenues collapse, Iran faces a potential currency devaluation spiral and mounting inflationary pressure. Brooks projects that Brent should not rise much above $120 even under extended disruption, suggesting markets are pricing in some capacity for alternative supply to fill the gap.
What to Watch
The April 22 truce expiry is the next critical date. If the fragile ceasefire collapses entirely, the market will need to reassess the duration of supply disruption and its implications for global growth, inflation, and central bank policy. Traders are also watching for any OPEC+ response — spare capacity among Gulf producers could partially offset Iranian barrels, but the political will to do so remains uncertain.
For energy-dependent economies across Asia and Europe, the blockade raises the spectre of sustained triple-digit oil prices through the second quarter and beyond.