Wars in Ukraine and the Middle East have pushed the world to the brink of a grave crisis, Jamie Dimon said. "Geopolitical matters are very serious – arguably the most serious since 1938," he told the Sunday Times. There's no point worrying about the market at times like these, the JPMorgan boss added. NEW LOOK Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Loading Something is loading. Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. download the app...