Federal Reserve Bank of St. Louis President James Bullard said the U.S. and world economies risk elevated inflation that persists for years should developed nations mistime their exits from easy monetary policies.

"Once inflation gets out of control, it takes a long, long time to fix it," Bullard said in a Bloomberg Television interview in Hong Kong today. "Ultra-easy" policies across the Group of Seven nations, which include the U.S. and Germany, may be retained for too long, he said.

U.S. monetary policy may be at a "turning point" and the Fed's first interest-rate increase since the global financial crisis could come as soon as late 2013, Bullard said in a speech earlier today. That view contrasts with a debate among Fed policy makers on whether more stimulus is needed even after the U.S. economy accelerated and the unemployment rate fell.