Most Asian stock exchanges ended Monday's session in the red as a combination of geopolitical risk and monetary policy concerns weighed heavily on investor sentiment. The primary catalyst for the market downturn stemmed from renewed doubts about Middle East peace efforts and signals from the Federal Reserve that interest rate increases could arrive sooner than previously anticipated. This convergence of macroeconomic and geopolitical pressures prompted portfolio managers to reassess their risk positioning, leading to modest but broad-based declines across the region's major indices outside Japan.

Oil markets surged in response to escalating tensions, with Brent crude climbing 1.1% to $81.43 a barrel following Iran's announcement that it had again blocked the Strait of Hormuz, a critical global energy chokepoint. Shipping data revealed a sharp contraction in vessel traffic through the waterway, with only 26 ships transiting on Saturday compared to 32 the previous day, underscoring the severity of the disruption. West Texas Intermediate crude advanced 2.7% to $78.70 per barrel, maintaining levels well above the $67 mark that prevailed before recent Middle East escalations. Despite these gains, crude remains far removed from May's peak of $126.41, suggesting markets anticipate either a resolution to tensions or a demand destruction that would moderate further price appreciation.

Vice President JD Vance's meetings with Iranian officials under an interim peace framework offered a glimmer of diplomatic progress, yet the discussions were quickly overshadowed by Tehran's renewed hard line on the Strait of Hormuz. Simultaneously, President Donald Trump posted on social media that UK Prime Minister Keir Starmer would resign, adding another layer of uncertainty to global markets. The combination of these geopolitical crosscurrents created an environment where investors favoured defensive positioning and reassessed their exposure to risk assets, particularly those sensitive to energy costs and interest rate movements.

Equity futures markets in the United States reflected the cautious mood, with S&P 500 contracts dropping 0.5% and Nasdaq futures sliding 0.7%. European benchmark indices mirrored this weakness, with EUROSTOXX 50 futures falling 0.5%, DAX futures declining 0.3%, and FTSE futures dipping marginally by 0.1%. The relatively modest magnitude of these declines suggested that markets had already partially priced in some of the Fed's hawkish pivot from last week, though further losses remained possible once additional economic data arrived during the week.

Across Asia-Pacific, performance diverged significantly by market and asset class. Japan's Nikkei Index bucked the regional trend by edging up 0.7%, extending its remarkable rally that saw the benchmark climb nearly 8% the previous week to reach all-time highs, a testament to selective strength in certain sectors despite broader headwinds. South Korea's market, by contrast, suffered a 0.9% decline after surging more than 11% in the preceding week on exceptional demand for semiconductor equities, suggesting some profit-taking and sector rotation. The MSCI Asia-Pacific Index ex-Japan eased 0.4%, capturing the tentative mood across the region's broader equity ecosystem.

The Federal Reserve's recent shift toward a more hawkish stance proved instrumental in reshaping market expectations around future interest rate policy. Markets now price in a 75% probability of at least one rate increase as early as September, a dramatic repricing from expectations just weeks earlier. Futures markets implied approximately 38 basis points of cumulative Fed tightening by year-end, substantially more than the market-neutral scenario that had dominated thinking during the earlier part of 2025. Yields on two-year Treasury notes climbed 4 basis points to 4.2276%, marking the highest level since early January, a move that typically reflects expectations for meaningful policy tightening ahead.

JPMorgan's cross-asset strategy team offered a counterpoint to the hawkish market consensus, maintaining a baseline expectation for the Fed's first rate increase in the second half of 2027. However, strategists acknowledged substantial risks tilted toward earlier action, particularly given limited margins for error on inflation and diminishing policy tolerance for price pressures. The investment bank remained constructive on risk assets, predicting that improving labour market conditions would sustain elevated interest rates over the medium term, thereby supporting selective leadership in quality growth equities, large-cap stocks, and technology shares. JPMorgan's S&P 500 target tilted toward 8,000 on the upside, though the path to that level appeared increasingly uncertain given near-term volatility.

Treasury markets faced sustained selling pressure as participants grappled with the Fed's more aggressive inflation-fighting stance. The Fed's preferred measure of core inflation is scheduled for release Thursday and is expected to tick upward to 3.4% in May, potentially justifying investor concerns about the persistence of price pressures and the necessity of higher rates. Monetary policy speakers including Federal Reserve Governor Christopher Waller and New York Federal Reserve Bank President John Williams are due to address markets during the week, likely clarifying the central bank's thinking on the inflation question and providing further guidance on policy timing.

Currency markets reflected both the Fed's hawkish bias and political uncertainty in key economies. The dollar strengthened to 161.44 yen, held just below the mid-2024 resistance level of 161.96 primarily by the implicit threat of Japanese intervention by authorities mindful of excessive yen weakness. The euro depreciated to $1.1462 after touching a three-month trough of $1.1418 on Friday, with markets sensitive to the economic implications of sustained higher interest rates in the eurozone. Sterling slipped 0.2% to $1.3210, weighed down by domestic political turmoil as multiple Labour government ministers called for Prime Minister Starmer's removal following Andy Burnham's sweeping parliamentary election victory. NAB strategists highlighted that gilt markets would likely face continued selling pressure in the week ahead, reflecting broader fiscal concerns stemming from the UK's leadership instability.

Commodity markets outside energy felt the weight of higher bond yields and risk-off sentiment. Gold, which generates no interest income and thus tends to suffer when Treasury yields rise, eased 0.1% to $4,154 per ounce, a relatively modest decline that reflected some safe-haven demand offsetting the headwind from elevated yields. The complex interplay between geopolitical risk driving oil higher and monetary policy concerns pressing yields higher created a challenging environment for traditional portfolio hedging strategies, suggesting investors would need to remain nimble in adjusting their allocations in the days and weeks ahead.