Asian equity markets started the week on a weak footing as geopolitical concerns about the Middle East peace process and rising US interest rate expectations conspired to dampen investor sentiment across the region. The pullback reflected a broad reassessment of risk, with crude oil prices climbing and Treasury yields surging in response to mounting uncertainties over the trajectory of American monetary policy and regional stability in the Persian Gulf.

The oil market emerged as the key barometer of Middle East tensions, with both major benchmarks advancing despite remaining well below their recent peaks. Brent crude futures gained 1.1% to settle at $81.43 a barrel, while West Texas Intermediate firmed 2.7% to $78.70, supported by Iran's announcement that it had once again restricted passage through the Strait of Hormuz. Vessel tracking data underscored the impact of these restrictions, with the number of ships transiting the crucial shipping lane falling to 26 on Saturday and 32 on Friday after earlier higher volumes. Although current crude prices remain substantially below the $126.41 per barrel peak reached in May, they have stabilised well above the $67 level prevailing before the conflict intensified, reflecting a persistent risk premium embedded into energy markets.

The timing of these oil price movements coincided with reports that Vice President JD Vance was meeting Iranian officials for preliminary talks under an interim peace framework. Yet these diplomatic overtures received little market support, overshadowed by President Donald Trump's threats of fresh military action against Tehran and separate reports that UK Prime Minister Keir Starmer was reconsidering his political future. The combination of heightened geopolitical risks and domestic political uncertainty created a cautious backdrop for equity investors navigating the start of the trading week.

Futures contracts pointing to Wall Street's opening indicated modest declines, with S&P 500 futures down 0.5% and Nasdaq-100 futures falling 0.7%. European equity futures similarly reflected conservative positioning, with the broad STOXX Europe 600 index futures sliding 0.5%, while German DAX futures shed 0.3% and London's FTSE futures edged down 0.1%. This transatlantic weakness suggested that concerns about US monetary policy tightening were resonating beyond Asia into developed markets more broadly.

Across Asia-Pacific exchanges, performance proved decidedly uneven. Japan's benchmark Nikkei index bucked regional trends by climbing 0.7%, extending an extraordinary run that had seen the index surge nearly 8% the previous week to touch all-time highs, reflecting sustained strength in the world's third-largest economy. South Korea's market proved far more vulnerable, sliding 0.9% after experiencing a spectacular 11% rally the prior week fuelled by voracious demand for semiconductor shares. The divergence underscored how sector composition and investor preferences remained crucial determinants of market direction. Across the broader Asia-Pacific region outside Japan, the MSCI index retreated 0.4%, capturing the overall cautious mood pervading the investment community.

The primary catalyst for equity market weakness stemmed from a dramatically hawkish pivot by the Federal Reserve announced the previous week, which prompted market participants to dramatically reprice interest rate expectations. Financial markets now assign a 75% probability to a rate increase as early as September, a sharp reversal from earlier assumptions of patient central bank policy. Year-end rate tightening projections moved to 38 basis points, while two-year Treasury note yields climbed 4 basis points to 4.2276%, reaching levels unseen since early 2025. This recalibration reflected growing concern that inflation remains insufficiently contained to permit the extended period of monetary accommodation that investors had previously anticipated.

JPMorgan's cross-asset strategy team, led by Fabio Bassi, articulated the tension between macro concerns and equity valuations. While their base case remains anchored on the first rate increase arriving in the second half of 2027, they acknowledge substantially elevated downside risks from persistent inflation that could trigger tightening well ahead of schedule. Despite these concerns, JPMorgan maintains a constructive stance on risk assets broadly, arguing that sustained labour market strength will support elevated real interest rates while maintaining a narrow leadership pattern favouring quality growth equities, large-cap stocks, and technology names. The team's price target for the S&P 500 tilts towards 8,000, suggesting meaningful upside potential if these scenarios materialise.

Treasury markets remained under sustained selling pressure as investors grappled with the implications of the Fed's hawkish stance. Scheduled data releases heightened this uncertainty, with the Fed's preferred core inflation gauge due Thursday expected to tick higher to 3.4% for May, underscoring the persistence of price pressures. Additional clarity will arrive through scheduled remarks from Federal Reserve Governor Christopher Waller and New York Federal Reserve President John Williams, who may offer guidance on the central bank's inflation assessment and policy trajectory. This data dependency created an extended period of uncertainty that discouraged equity risk-taking.

Currency markets reflected both the monetary policy repricing and discrete political risks. The dollar maintained firm footing at 161.44 yen, with the only constraint on further strengthening being the ever-present threat of Japanese intervention to prevent testing the 161.96 resistance level established in mid-2024. The euro weakened to $1.1462, extending Friday's retreat toward the three-month low of $1.1418, as investors reassessed growth prospects across the eurozone. Sterling proved particularly sensitive to UK political developments, slipping 0.2% to $1.3210 as Starmer faced mounting internal party pressure and speculation about his leadership. NAB market strategist Skye Masters warned that gilt yields would likely face continued selling pressure as political uncertainty around the British premiership raised questions about the fiscal outlook.

The political turbulence surrounding UK Prime Minister Keir Starmer added an important secondary layer to the week's risk assessment. Reports suggested that Andy Burnham's decisive parliamentary election victory had emboldened critics within the Labour Party to call for Starmer's departure, with President Trump chiming in to predict the Prime Minister's resignation. This domestic political drama, though geographically distant from Asia, nonetheless affected regional markets by raising uncertainty about fiscal policy settings and broader policy direction in a major Western economy. The instability demonstrated how interconnected global capital markets have become, with leadership transitions in one nation rippling through international markets.

Commodity markets beyond oil reflected the broader move higher in interest rates, which typically pressures assets that generate no yield. Gold prices dipped 0.1% to $4,154 per ounce as rising Treasury yields increased the opportunity cost of holding the non-interest-bearing precious metal. This weakness, though modest, underscored how investors were recalibrating portfolio positioning in response to the monetary policy repricing emanating from the United States.

The confluence of factors at play—Middle East geopolitical risks, Federal Reserve hawkishness, elevated inflation data, and British political uncertainty—created a complex backdrop for investors across Asia. While some markets like Japan managed to extend recent gains, the broader momentum appeared to have stalled as participants reassessed the sustainability of the recent equity rally against a backdrop of tightening financial conditions and elevated macro risks. The coming weeks would likely prove decisive in determining whether markets could stabilise around higher interest rate expectations or whether recession concerns would intensify selling pressure.