A sharp escalation in Middle East tensions sent shockwaves through global financial markets after U.S. President Donald Trump declared at the NATO summit in Ankara that the memorandum of understanding (MoU) and ceasefire with Iran is 'over' [2][4][8]. Trump confirmed, 'We attacked very powerfully last night, the very dangerous people from Iran,' referencing U.S. airstrikes on Iranian military infrastructure in response to Tehran's attacks on commercial shipping in the Strait of Hormuz, a critical passage for nearly one-fifth of global energy supply [2][6]. The U.S. Treasury Department also revoked licenses allowing Iran to sell oil globally [1].
The immediate market reaction was pronounced. Brent crude futures surged 6.18% to $78.73 per barrel, while U.S. West Texas Intermediate (WTI) futures jumped 6.45% to $74.93, with WTI hitting a two-week high [2][8]. Brent crude had earlier spiked from $72 to $76 per barrel following the Iranian strikes [1]. U.S. Treasury yields soared, with the 10-year note up more than 5 basis points to 4.5812%, the 2-year yield rising to 4.2182%, and the 30-year yield climbing above 5.0752% [1][8]. The surge in yields reflects heightened risk aversion and expectations of potential inflationary pressures from higher energy prices.
Equity markets responded with risk-off sentiment. Dow Jones futures fell 0.40% to around 52,980, S&P 500 futures dropped 0.17% to near 7,540, and Nasdaq 100 futures slipped 0.14% to 29,350 during European trading hours [6]. The previous session saw the Nasdaq Composite down 1.16%, S&P 500 off 0.45%, and Dow Jones Industrial Average lower by 0.25% [6]. S&P 500 futures tumbled over 0.7% at one point, reflecting deep investor anxiety [4]. The Australian Dollar reversed early gains and traded lower near 0.6915 against the U.S. Dollar as investors sought safe-haven assets [4]. Currencies of oil-importing economies were noted as likely to suffer from higher oil prices [2].
Market participants are closely watching for further developments, particularly the expiry of the interim ceasefire agreement in mid-August and the risk of a broader regional conflict, which could further disrupt global energy corridors [1][6]. Analysts at DBS and MUFG noted that while oil prices have surged, they remain below crisis levels seen in previous escalations, and inflation risks are currently contained unless the conflict intensifies [1][3]. However, the risk of re-escalation and continued problems in the Strait of Hormuz could alter the outlook for Federal Reserve policy, with some analysts suggesting that current market pricing for rate hikes may be too aggressive if energy prices do not rebound sharply [3].
Investors are also awaiting the release of the Federal Open Market Committee (FOMC) June meeting minutes, the first under new Fed Chair Kevin Warsh, for further clues on the future path of U.S. interest rates [4][6][8]. Warsh recently stated that 'inflation risks have come down,' and policymakers agreed that forward guidance is not well-suited in the current environment [1][4].
CONCLUSION
President Trump's declaration that the Iran ceasefire is over triggered a surge in oil prices and U.S. Treasury yields, while equity markets and risk-sensitive currencies fell amid heightened geopolitical risk. While inflation and policy risks remain contained for now, markets are bracing for further volatility as investors await both geopolitical developments and the latest FOMC minutes for monetary policy direction.