SynopsisRising oil prices and elevated bond yields, driven by Middle East tensions, are raising concerns over the sustainability of the U.S. stock market rally. While strong earnings and AI-driven spending support equities, persistent inflation risks and tighter monetary expectations could pressure valuations and increase near-term volatility.ETMarkets.comOil, yields rise put Wall Street rally at riskEscalating conflict in the Middle East has pushed oil prices sharply higher and driven U.S. Treasury yields towards multi-month highs, prompting investors to question whether the resilience of the U.S. stock market can withstand mounting geopolitical and inflationary pressures.According to Reuters, Brent crude briefly climbed above $100 a barrel last week for the first time since May after renewed attacks disrupted shipping routes in the Strait of Hormuz and the Red Sea, stoking fears of tighter global supplies. Although crude prices eased at the start of the week following signs of a temporary pause in hostilities, they remain well above pre-conflict levels, keeping inflation concerns alive.The surge in oil prices has also lifted Treasury yields as investors reassessed the outlook for U.S. monetary policy. The benchmark 10-year Treasury yield climbed to around 4.7%, its highest level since early 2025, reflecting expectations that the Federal Reserve may have to keep interest rates higher for longer if elevated energy prices feed into broader inflation.Bond market sends warning signalWhile U.S. equities have largely weathered rising yields this year, market participants are becoming increasingly cautious.Higher Treasury yields reduce the present value of future corporate earnings, making richly valued growth stocks, particularly technology companies, more vulnerable. They also increase borrowing costs for businesses and consumers, potentially slowing economic activity.The recent rise in long-term yields has been accompanied by growing expectations that the Federal Reserve could maintain a restrictive policy stance for longer than previously anticipated. Futures markets have also increased the probability of another rate hike this year following the jump in oil prices.AI-driven optimism faces fresh testDespite the macroeconomic headwinds, the U.S. equity rally has so far remained supported by strong corporate earnings and significant artificial intelligence-related spending by major technology companies.Reuters reported that investors continue to rely on hyperscalers' aggressive capital expenditure plans as a key pillar of earnings growth. However, persistently higher interest rates could make financing these investments more expensive, potentially forcing companies to reassess spending plans over time.The concern is particularly relevant as several of the largest U.S. technology companies prepare to report quarterly earnings this week, with investors closely watching both AI spending commitments and management commentary on future investments.Earnings remain key supportEven with oil near $100 a barrel, many strategists believe the broader equity rally is unlikely to derail unless higher energy prices begin to significantly hurt corporate earnings or consumer spending.The U.S. economy has remained relatively resilient, supported by a strong labour market and healthy consumer demand. Unless elevated oil prices persist long enough to materially weaken earnings expectations, analysts believe the fundamental case for equities remains intact, even if volatility increases in the near term.For now, investors are balancing three competing forces: geopolitical uncertainty, rising bond yields and the earnings outlook. Any sustained escalation in the Middle East or a further climb in Treasury yields could increase pressure on equity valuations, while easing tensions and solid corporate results may help markets regain their footing.Read More News on(What's moving Sensex and Nifty Track latest market news, stock tips, Budget 2025, Share Market on Budget 2025 and expert advice, on ETMarkets. Also, ETMarkets.com is now on Telegram. For fastest news alerts on financial markets, investment strategies and stocks alerts, subscribe to our Telegram feeds .) Subscribe to ET Prime and read the Economic Times ePaper Online.and Sensex Today. 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