The U.S. bond market is flashing urgent warning signals once again. After a brief reprieve fueled by optimism that peace talks with Iran might ease geopolitical tensions, yields on the benchmark 10 years Treasury Note have spiked to 4.42%, reigniting fears across global markets.

The surge has rippled through the financial system like mortgage rates which have climbed to a fresh seven-month high. Also equity markets are bracing for potential Federal Reserve rate hikes, and the S&P 500 shed a staggering $800 billion in market value in a single day.

Analysts are warning that the bond market’s instability is posing a far greater challenge to the U.S. economy than rising energy prices. The prospect of a 5% yield on the 10year Note is seen as a red line—one that could trigger deeper financial stress, tightening credit conditions, and further equity market losses.