Few international dangers confronting the United States have more serious and far-reaching implications for national security and worldwide stability than the proliferation of weapons of mass destruction (WMD). The legendary Chinese master of military strategy, Sun Tzu, is reported to have said that the best method of preserving security is to avoid direct battle and instead attack the enemy's plans and strategies. That, in essence, is a fundamental principle of the nonproliferation policy of the United States. If we can determine and understand the plans and intentions of would-be proliferators of weapons of mass destruction, and then frustrate those plans before they reach fruition, we will have preserved the security of our nation without having to confront the devastating power of the weapons themselves. The proliferation of WMD is a global problem that cuts across geographic, political, and technological lines. It involves some of the largest and smallest, richest and poorest countries led by some of the most reactionary and unstable regimes Many potential proliferators are convinced that they need to develop WMD and associated delivery systems to protect their national security.