The U.S. nuclear triad must be modernized to keep pace with changing threats in the future, the nation’s senior officer in charge of strategic forces said on Tuesday. Air Force Gen. Anthony Cotton, speaking at a Center for Strategic and International Studies event, added “for the United States nuclear deterrence is baseline strategy” stopping adversaries from crossing thresholds because they know American capability to respond. China, being a nuclear power and rapidly expanding its arsenal, changes the strategic equation from the Cold War with the Soviet Union, he said. Where there was little economic interaction between Moscow and Washington in...