Why did U.S. allies oppose using nuclear weapons during the Korean War?

During the Korean War, U.S. allies—most notably represented by British Prime Minister Clement Attlee—strongly opposed the use of nuclear weapons or the expansion of the conflict into a wider war.1

This opposition was rooted in the fear that escalating the conflict in Asia would divert critical resources and attention away from Europe, leaving the region vulnerable to a potential attack by the Soviet Union. Military leaders, such as General Omar Bradley, further cautioned that expanding the war would involve the United States in the "wrong war, at the wrong place, at the wrong time and with the wrong enemy," arguing that such actions would be strategically disastrous.1

While the United States later considered nuclear threats as a means to achieve an armistice in 1953, the initial allied resistance reflected a collective desire to contain the conflict and prevent a global escalation that could have catastrophic consequences for Western security.1