Global oil prices reversed their recent downward trend on Wednesday, spiking sharply after the United States launched military strikes against Iran and reinstated oil sanctions, casting doubt over a tentative ceasefire that had briefly calmed energy markets.The international benchmark, Brent crude, jumped as much as 3% during trading, briefly surpassing $76 a barrel for the first time in a fortnight. By 04:00 GMT, September futures were trading at $76.07—the highest level recorded since June 23....