U.S. stock markets are experiencing declines as technology stocks come under pressure, dragging the S&P 500 and Nasdaq lower. This downturn coincides with rising tensions related to Iran, which are testing investor confidence ahead of a significant week filled with earnings reports, including that from Nvidia. Futures indicate a lower opening for Wall Street, and concerns over elevated bond yields continue to weigh on market sentiment. Meanwhile, oil prices have risen, adding to the downward pressure on stocks as traders anticipate critical economic updates.