The Trump administration has been clear-eyed about the shift from a unipolar, hegemonic American-led global order to a multipolar one in which the United States will be, though still the strongest, one of many poles. In recognition of this strategic reality, the administration has affected dramatic changes in domestic and foreign policy: its efforts at reform have encompassed world trade, military preparedness, relations with allies and adversaries, and internal governance. Untouched thus far in this raft of policy rewrites, however, has been America’s approach to great power nuclear negotiations…