"[F]urther provocative action would be regrettable," U.S. Defense Department spokesman George Little said Friday.
Traditional allies of North Korea, including China and Cuba, are evidently uneasy about North Korea's rhetoric. In an editorial published Thursday by Cuban news publication Granma, longtime Cuban leader Fidel Castro – who handed over power to his brother in 2011 – urged Kim not to pursue nuclear war.
"This is about one of the most serious dangers of nuclear war since the [Cuban Missile Crisis] in 1962, 50 years ago," Castro wrote. He urged Kim to avoid using nuclear weapons and consider that "it would be unjust to forget that such a war would particularly affect more than 70 [percent] of the population of the planet."