How to keep future cold wars cold: Mind the missiles

At a time when we are reflecting on the lessons from the Cold War amid growing concern about the current U.S.-Russia relationship, we should be looking ahead to anticipate how changes in technology and geopolitics create new challenges to peace and stability among the world's major powers. The Cold War stayed cold largely because the United States and the Soviet Union possessed nuclear weapons that raised the risk of an armed conflict between them to an unacceptable level. The destructiveness of nuclear weapons and the lack of effective defenses against them contributed to the strategic stability between the superpowers. Neither side had an incentive to strike first, and this...