Oil Prices Rise and Asian Markets Fall in Response to US-Iran Military Strikes

On May 26, 2026, the US military conducted what it described as "self-defense strikes in southern Iran," targeting vessels allegedly deploying mines and missile launch sites [1]. Brent crude jumped more than 3% to close at $99.58 per barrel, while Asian equities fell across the board [2]. The strikes were the latest escalation in a conflict that has, since late February, redrawn the global energy map — shutting the Strait of Hormuz, triggering the largest emergency oil release in history, and forcing oil-dependent Asian economies into crisis management.

The Price Shock: From $74 to $126 in Two Months

Before Operation Epic Fury launched on February 28, 2026, Brent crude traded near $74 per barrel [3]. Within days of the initial US and Israeli strikes on Iranian military and nuclear targets, prices surged 10–13% to around $80–82 [4]. By mid-March, with Iran's closure of the Strait of Hormuz choking global tanker traffic, Brent had crossed $110 [5]. The peak came on April 30, when Brent briefly touched $126.41 — its highest level in four years — before pulling back to $115.80 as trading volumes thinned [6].

Source: CNBC / Trading Economics

Data as of Jun 8, 2026CSV

WTI crude, the US benchmark, has traced a similar arc. FRED data shows WTI climbing from around $60 in late February 2026 to $114.58 by April, before settling near $96 in early June — still up 51.7% year-over-year [1].

Source: FRED / EIA

Data as of Jun 1, 2026CSV

How does this compare to prior Middle East–driven oil spikes? After the January 2020 US drone strike that killed Iranian General Qassem Soleimani, oil jumped briefly to near $70 per barrel — a sharp but short-lived move that reversed within weeks as Iran's retaliation proved limited [7]. During Iraq's 1990 invasion of Kuwait, crude roughly doubled from $17 to $36 over three months before falling once coalition bombing began in January 1991 [8]. The 2026 shock is closer in magnitude to the 1990 episode but has already persisted far longer, because unlike past incidents, this conflict has actually shut a major chokepoint.

Asian Markets: The Hardest Hit

Asian equity markets have absorbed repeated waves of selling since the conflict began. In the trading sessions following the late May strikes, South Korea's Kospi fell 1.84%, Japan's Nikkei 225 dropped 1.36%, and Hong Kong's Hang Seng lost 1.31% [9]. India's Nifty 50 and Australia's S&P/ASX 200 declined more modestly, by 0.78% and 0.92% respectively [9].

Source: CNBC

Data as of Jun 4, 2026CSV

These late-May losses were relatively contained compared to the broader drawdowns earlier in the conflict. In late March, CNBC reported that Asian markets "tumbled" as the Middle East conflict spiral showed "no sign of abating" [10]. Airlines, shipping firms, and energy-intensive manufacturers bore the heaviest losses, as jet fuel and freight costs surged alongside crude. Energy stocks, by contrast, benefited from higher prices, and gold attracted safe-haven flows throughout the period [10].

The S&P 500 in the US also experienced sharp volatility in late February and early March, dropping from above 6,300 to below 5,000 before recovering [2]. As of early June, the index sits near 7,400 — suggesting US markets have, at least for now, priced in the conflict's continuation.

Source: FRED / S&P Dow Jones Indices

Data as of Jun 9, 2026CSV

The Strait of Hormuz: 20% of Global Oil at Risk

The Strait of Hormuz, a 21-mile-wide passage between Iran and Oman, is the world's most critical oil transit chokepoint. According to the US Energy Information Administration, nearly 15 million barrels per day of crude transited the strait in 2025 — roughly 34% of all global crude oil trade and about one-fifth of global oil consumption [11]. About 80% of oil and petroleum products passing through the Strait was destined for Asia [12]. The strait also carries 19% of global LNG trade, including 93% of Qatar's and 96% of the UAE's LNG exports [11].

Iran's closure of the strait, combined with a US naval blockade of Iranian ports, has created what the IEA head described as "the greatest global energy security challenge in history" [4]. Global oil supply fell by 10.1 million barrels per day in March 2026, and observed global inventories dropped by a combined 246 million barrels in March and April [13].

Only Saudi Arabia and the UAE have pipelines capable of bypassing the strait, with an estimated 3.5 to 5.5 million barrels per day of rerouting capacity — well short of the full volume normally transiting the chokepoint [11]. On March 11, 2026, IEA member countries unanimously agreed to release 400 million barrels from emergency reserves, the largest such release in the agency's 50-year history [14]. The US contributed 172 million barrels from its Strategic Petroleum Reserve — 43% of the IEA total — to be released over 120 days at a rate of 1.4 million barrels per day [14]. But as Al Jazeera noted, this "may calm markets but cannot fix the Hormuz disruption," since the release rate covers only about 15% of the supply lost [15].

The Case That Markets Are Overreacting

Some analysts have argued that the market reaction is disproportionate. Before the conflict, Iranian oil exports were already heavily constrained by US sanctions. Much of Iran's crude reached global markets through opaque channels, and the direct loss of Iranian barrels is smaller than the headline disruption figures suggest [16].

Historical data also support skepticism about the durability of conflict-driven oil spikes. MSCI research shows that Middle East military escalations have generally produced price spikes that reverse within weeks or months, with the notable exceptions of the 1973 Arab oil embargo and 1979 Iranian Revolution — both of which involved sustained, deliberate supply restrictions [8]. The 1990 Gulf War spike lasted only nine months. The Soleimani strike in 2020 produced a price increase that unwound within days [7].

However, what distinguishes 2026 is the physical closure of the Strait of Hormuz. Past conflicts threatened the chokepoint but never closed it. The current disruption is not a fear premium layered onto stable supply — it reflects actual barrels removed from the market, which undercuts the analogy to prior short-lived spikes.

Asia's Structural Exposure

The energy shock falls hardest on economies that import most of their oil. Japan imports approximately 95% of its oil consumption, South Korea 92%, India 85%, and China 70% [17]. Net oil and gas imports amount to about 2.5% of GDP across Asia overall, but the figure is considerably higher for individual economies — exceeding 10% of GDP in Malaysia and Thailand [17].

Source: IEA / IMF

Data as of Apr 16, 2026CSV

The IMF projected in April 2026 that emerging Asia's inflation would rise from 1.1% in 2025 to 2.6% in 2026 — 0.4 percentage points above the January forecast [17]. Asia's overall GDP growth is expected to moderate to 4.4% in 2026, down from 5% in 2025, with adverse scenarios cutting an additional percentage point [17]. Higher bond yields, a stronger US dollar, currency depreciation, and elevated risk premia are all hitting fossil fuel importers particularly hard [17].

The Council on Foreign Relations reported that 84% of oil and 83% of LNG shipped through the Strait of Hormuz in 2024 was bound for Asia, and that Japan, Singapore, Taiwan, South Korea, India, and Thailand are "almost completely dependent on foreign oil" [18]. Indonesia's government deficit has exceeded 3% of GDP due to fuel subsidies, and the country faces political instability risks — the CFR piece noted that Indonesia's 1998 uprising was "partly sparked by a sharp rise in fuel prices amidst the Asian financial crisis" [18].

India, which runs a structural current account deficit of roughly 1% of GDP, is among the most vulnerable to currency pressure if elevated prices persist. Japan and South Korea benefit from current account surpluses that provide some buffer, but their near-total oil import dependence creates severe exposure on the energy cost side [17].

The Constitutional Question

The conflict's legal basis has faced sustained challenge in Congress. On June 3, 2026, the House passed a War Powers Resolution by a vote of 215 to 208, with four Republicans joining Democrats, directing the president to end hostilities with Iran [19]. The vote marked the first time such a measure cleared either chamber on a final vote since Operation Epic Fury began on February 28 [19].

Under the 1973 War Powers Act, the president has 60 days to end hostilities absent congressional authorization, with a possible 30-day extension. Trump did not present Congress with an authorization request — a departure even from prior presidents who used force unilaterally but still sought after-the-fact approval [20]. The administration's legal rationale, outlined by the State Department's Office of the Legal Adviser, rested on Article II self-defense authority and the claim that Iranian nuclear and missile capabilities posed an imminent threat [21].

Critics have challenged the "imminence" argument. Norway's Foreign Minister publicly stated that the strikes were "not in line with international law" and that "preventive attacks require an immediately imminent threat" [22]. UK Prime Minister Keir Starmer, in a joint statement with France and Germany, condemned Iranian counter-strikes and called for diplomacy, while adding that he did "not believe in regime change from the skies" [22]. The House measure, if enacted, would require withdrawal of forces within 30 days unless Congress specifically authorizes continued operations, but Trump is expected to veto it [19].

Iran's Retaliatory Options

Iran's response to Operation Epic Fury has operated across multiple domains. Tehran launched missile and drone counter-strikes against Israel, Gulf states, and US military bases, while shutting the Strait of Hormuz to maritime traffic [22]. The Homeland Security Today assessment described Iran's strategy as a "layered military, cyber, and proxy" approach — broadening the battlefield through partners while complementing conventional action with covert and cyber operations [23].

On the cyber front, Iranian state-sponsored groups including APT33, APT35, OilRig, and MuddyWater launched attacks against US, Israeli, and allied infrastructure, including DDoS attacks, data wipers, and information operations [24]. Palo Alto Networks' Unit 42 tracked escalating Iranian cyber operations throughout the conflict [25]. However, analysts noted that the domestic internet blackout and disruption of Iranian leadership — including the assassination of Supreme Leader Ali Khamenei on February 28 — severely limited state actors' coordination capacity in the conflict's early days [24].

Iran's trilateral strategic pact with China and Russia, signed on January 29, 2026, has provided diplomatic cover and some economic resilience, though it does not constitute a mutual defense treaty [24]. The Brookings Institution warned that the US and Israel "have unleashed a confrontation that is unlikely to succeed and certain to produce unintended effects that they will be unable to manage or contain" [26].

Dissent and Strategic Warnings

Opposition to the strikes has come from both allied governments and within the US policy establishment. Poland's Defense Minister warned that prolonged Middle East conflict could jeopardize arms supplies to Ukraine and provide Russia an economic boost through higher energy prices [22]. Brookings analysts identified specific risks including alliance strain, oil market destabilization, and the erosion of international law norms — which, they argued, makes nations in the Global South "feel insecure, and more likely to support a coalition against US interests" [26].

The Stimson Center's expert roundtable on the strikes flagged "the limits of airpower," the severity of the oil shock, and a "constitutional crisis at home" as central concerns [27]. The Small Wars Journal published analysis arguing that the US was failing to prosecute a coherent strategy, with senior leaders presented with limited options beyond escalation [28].

The House's War Powers vote reflected broader institutional unease. The 215-208 margin — the fourth such vote since the conflict began — demonstrated a persistent, if narrow, bipartisan objection to the war's continuation without explicit congressional authorization [19].

What Comes Next

As of early June 2026, the conflict exists in an uneasy equilibrium. A ceasefire declared on April 7 remains nominally in place, but the Strait of Hormuz is still effectively closed under dual US and Iranian blockades [6]. Brent crude has pulled back from its April peak but remains near $94 — far above pre-conflict levels [6]. The IEA's record strategic reserve release is buying time, but at current draw rates, the cushion is finite.

The structural facts remain unchanged: Asia depends on the Strait for the vast majority of its oil and gas imports, no pipeline alternatives can replace the lost volume, and the conflict's political and legal foundations remain contested. Whether this becomes a sustained supply shock comparable to 1973, or a months-long disruption that eventually unwinds, depends on variables — the durability of the ceasefire, the pace of diplomatic engagement, and the willingness of either side to reopen the strait — that remain outside any analyst's ability to forecast with confidence.