Oil prices plummeted as much as 7.4% on Monday, with Brent crude briefly falling below $90 a barrel and West Texas Intermediate (WTI) crude dropping 5.4% to $84.46 a barrel. This sharp decline follows a near two-week pause in strikes by the US against Iran and a corresponding halt in retaliatory attacks from Tehran. The de-escalation in Middle East tensions has led to hopes for diplomatic solutions and a calming of market fears regarding energy supplies, which had previously driven oil prices higher in July.

The easing of oil prices is significantly impacting expectations for the Federal Reserve's upcoming interest rate decision. Traders are closely watching whether the Fed will raise rates in response to past inflation concerns fueled by higher energy prices. While officials are expected to emphasize vigilance over inflation, analysts like Krishna Guha, head of central bank strategy at Evercore ISI, believe a rate hike is unlikely. However, given the new Fed chair Kevin Warsh's refusal to outline his strategy, the probability of a hike cannot be entirely dismissed. The sudden drop in oil prices could provide the Fed with more breathing room to maintain current rates, tempering earlier bets on rate increases.

Global markets are reacting positively to the de-escalation and falling oil prices. MSCI's Asia Pacific equities gauge rose 0.4%, and contracts for the Nasdaq 100 Index climbed 1.2%. The dollar, which had performed as a safe haven during the Middle East conflict, weakened against most of its Group-of-10 peers. Despite the positive market reaction, some uncertainty remains, particularly regarding the lasting nature of the de-escalation and the ability for vessels to navigate the Strait of Hormuz without threat, as attacks by Houthis in Yemen on Saudi oil installations (including in Yanbu) continue, shifting the route for the bulk of Saudi exports.