As the debate on a U.S. national missile defense intensifies, the decision about whether the United States should develop an NMD system seems to be giving way to questions over the type of system to be deployed and its scope: For example, should the United States pursue NMD against Russia or China? What are the possible security benefits and costs of limited NMD? What can the United States do to counter the international political fallout of limited NMD?

Current U.S. nuclear strategy identifies new nuclear counterforce missions as a means of impeding the proliferation of weapons of mass destruction.