Among the signals that a major U.S. operation is not imminent is a trip just underway by Marine Gen. Joseph F. Dunford Jr., the chairman of the Joint Chiefs of Staff, and a small cadre of his staff. He arrived Friday in Hawaii with plans to visit Japan, South Korea and China, all of which would be in peril if a war between North Korea and the United States explodes.

The aircraft carrier USS Ronald Reagan and its accompanying flotilla of destroyers and guided-missile cruisers also returned to port Wednesday in Yokosuka, Japan, the Navy announced. The ships and the thousands of U.S. service members aboard spent three months patrolling the region and could have stayed at sea off the coast of the Korean Peninsula if the Pentagon was preparing for near-term conflict.