SEOUL, South Korea — When news broke less than two weeks ago that the Trump administration was sending the aircraft carrier Carl Vinson to the Korean Peninsula, many South Koreans feared a war with North Korea. Others cheered for Washington, calling the deployment a powerful symbol of its commitment to deterring the North.

On Wednesday, after it was revealed that the carrier strike group was actually thousands of miles away and had been heading in the opposite direction, toward the Indian Ocean, South Koreans felt bewildered, cheated and manipulated by the United States, their country’s most important ally.

“Trump’s lie over the Carl Vinson,” read a headline on the website of the newspaper JoongAng Ilbo on Wednesday. “Xi Jinping and Putin must have had a good jeer over this one.”

“Like North Korea, which is often accused of displaying fake missiles during military parades, is the United States, too, now employing ‘bluffing’ as its North Korea policy?” the article asked.