Oil prices fell sharply and European stock markets rose on Monday, August 3, 2026, after President Donald Trump called off planned military strikes on Iran and said he would try negotiating a peace deal instead. The price of Brent crude, a key oil benchmark used worldwide, dropped 5.16% to $83.39 a barrel. The US oil price, called West Texas Intermediate, fell more than $5 to $79.47 a barrel. Reuters reported prices tumbled more than $4 a barrel on the day. The pan-European Stoxx 600 index, which tracks hundreds of companies across Europe, rose 0.4%. Energy stocks declined 2%, while travel and leisure shares gained 2.1% (The Guardian, CNBC, Reuters).

Trump announced late Saturday, August 1, on his Truth Social platform that Iran and other Middle Eastern countries had asked for time to complete a deal that would lead to the "Immediate, Complete and Total reopening of the Strait and an end to Iran's nuclear threat." On Sunday, August 2, he confirmed he had called off a planned strike on Iran and said talks with Tehran would begin Monday (The Guardian, CNBC).

The Strait of Hormuz is the narrow strip of water between Iran and Oman through which about a fifth of the world's oil passes. Think of it as a toll booth on the world's busiest oil highway. When shipping through that strait is threatened, oil prices jump because buyers worry supplies won't get through. Shipping data showed two tankers loaded with Saudi oil transited the Bab el-Mandeb Strait, another chokepoint, out of the Red Sea over the weekend of August 1–2. Meanwhile, traffic through Hormuz slowed after reports of vessel attacks. The United Kingdom Maritime Trade Operations Centre reported three additional tanker attacks since Saturday, August 1, meaning the danger in the waterway has not gone away even as talks open (The Guardian).

This latest shift follows a year of fighting and failed truces between the US and Iran. In February 2025, Trump signed a memorandum restoring "maximum pressure" on Iran, which means using economic sanctions, penalties that cut a country off from international trade, to squeeze Iran's economy. By February 2026, the White House reported that Trump had deployed a massive naval fleet to the region, urging Iran to negotiate. In March, the administration launched "Operation Epic Fury" against the Iranian regime, saying it had tried negotiating in good faith before striking. An April ceasefire announcement declared that Iran had agreed to a ceasefire and the reopening of the Strait of Hormuz. Fighting resumed within weeks, sending both major oil prices up more than 20% in July 2026 after renewed hostilities and attacks on tankers in the Strait of Hormuz (White House, February 2025, White House, February 2026, White House, March 2026, White House, April 2026, The Guardian).

OPEC+, a group of oil-producing countries that works together to control how much oil reaches the market, moved on Sunday, August 2, to raise production by about 188,000 barrels per day starting in September 2026. The decision had little impact on prices because oil exports from the Gulf have been disrupted by the Iran and Ukraine wars and related problems with Russian and Kazakh oil flows. Those disruptions have kept actual oil supply tight no matter what OPEC+ decides about its quotas (The Guardian).

The oil price drop affected other parts of the financial system. Kathleen Brooks, research director at broker XTB, said the drop should help support markets, ease inflation fears, and lower bond yields, which are the interest rates governments pay to borrow money. Thirty-year US Treasury yields had jumped to their highest level in 19 years in the week ending around July 30, 2026. Meanwhile, the Japanese yen hit a three-month high on August 3 after Tokyo and Washington launched a joint intervention to support the currency (The Guardian, The Guardian).

The bigger picture is that markets have watched this cycle of fighting and truces repeat itself, and each time a ceasefire falls apart, confidence that any deal will last gets weaker. The April ceasefire collapsed into renewed fighting within weeks. OPEC+ supply increases have been wiped out by war-driven disruptions, so the price of oil is being held up by political risk, not by production decisions. And the spike in US government borrowing costs to a 19-year high tells us that markets are worried about more than just oil: higher oil prices push up inflation, inflation pushes the Federal Reserve to keep interest rates high, and those high rates spread through the entire financial system, from the Japanese yen to European interest rate expectations.

Tony Sycamore, a market analyst at IG, raised the key question: whether this week turns into a repeat of last week, with hopes of a deal collapsing as Iran uses its control over the strait as a bargaining chip. That has already happened once. The shipping data and reports of continued tanker attacks suggest the danger in Hormuz persists regardless of the talks. If negotiations open on Monday and stall within days, the drop in oil prices could reverse quickly, since both major oil prices are still high after July's 20% surge.

For now, markets are betting on the possibility of a deal. The Stoxx 600's gains outside the energy sector, the yen's rally, and the bond yield pullback all reflect a single wager: that Trump's choice to talk rather than strike holds this time. Whether it does depends on things the oil market cannot fully predict: Iran's willingness to give up its leverage over the Strait of Hormuz in exchange for relief from sanctions, how much trust Iran can place in US security guarantees, and whether the tanker attacks of the past 72 hours are leftover skirmishing or an active effort to sabotage the talks.