"President Truman was right to order the use of atomic weapons against Japan and so shorten the war," Mr. Bush said in an email. "Still, it was appropriate for President Obama to show remorse that the people of Hiroshima and Nagasaki suffered so grievously as a result. After all, they had absolutely no say in Japan's decisions to go to war, to conduct operations with such brutality, and to continue the fighting long after the ultimate outcome was clear. The horror of their deaths may be one reason that atomic or nuclear weapons have fortunately not been used since."
"Threatening to end the armistice is one of Pyongyang's hardy perennials, an action that conveys frustration that Washington is not willing to talk with it on anything close to North Korea's terms," said Mr. Bush, director of the think tank's Center for Northeast Asian Policy Studies.