Stock markets fell sharply on Wednesday after President Trump announced at the NATO summit in Turkey that the ceasefire between the US and Iran was "over." The Dow Jones dropped about 1%, or roughly 500 points. Other major US indexes also fell, though they bounced back slightly as the day went on The Guardian.

Trump said more than just that the ceasefire was done. He called Iran's leaders "sick people" and said the US was continuing military strikes on Iranian targets. He also made an unusual claim about Iran having military ties to Spain—something NATO allies at the summit have not confirmed The Guardian.

Oil prices jumped immediately. Brent crude—the global benchmark for oil—shot up more than 5% to $80 a barrel, a price not seen in recent months. When there is conflict or tension in the Middle East, oil traders get nervous because the region supplies a lot of the world's energy The Guardian. At the same time, Russia announced it was cutting off diesel exports after Ukraine attacked Russian refineries, making fuel even scarcer Reuters. US gas prices are already at $3.79 a gallon, up 65 cents from a year ago.

Stock indexes fell not just in the United States but around the world. London's main index dropped 1%, and Tokyo's dropped 2.1% The Guardian.

Why does this matter beyond just one bad day? The US already faces a bigger inflation problem. Prices rose 4.2% over the past year—more than double what the Federal Reserve (America's central bank) aims for. That is the worst inflation in three years The Guardian. The Fed has been raising interest rates to try to cool prices down, and some officials have said rates may need to go higher before the year ends.

Now Kevin Warsh, who became Fed chair in May, faces a very difficult situation. Usually when inflation is high, the central bank fights it by making borrowing more expensive, which discourages spending and cools the economy. But when the problem is oil prices jumping due to Middle East tensions, raising rates does not actually fix the shortage. It just makes everything else more expensive for people trying to borrow—to buy a house, a car, or start a business. This can slow the economy without stopping inflation, a scenario called stagflation Federal Reserve.

What happens next depends on whether Trump's announcement signals real escalation with Iran or is just strong rhetoric for the cameras. Investors will watch shipping traffic through the Persian Gulf and any military moves to see if things are actually heating up. They will also watch whether markets bounce back in the coming days or whether this Wednesday selloff is just the beginning.