The NPT offered non-nuclear weapon states all the know-how and most of the materials they needed to become nuclear armed, if only they promised not to do so.

CENTERFORSECURITYPOLICY: Dangerous disarmers

Assurances to non-nuclear weapon states.

CENTERFORSECURITYPOLICY: Center for Security Policy | EXCERPTS OF TESTIMONY BY DR. J.D. CROUCH II of the Center for Defense and Strategic Studies, Southwest Missouri State University, before the Senate Foreign Relations Committee

And we recognized the value of national negative security assurances -- assurances that the United States and other nuclear powers have made that we will not threaten -- use or threaten to use nuclear weapons against other state -- non-nuclear weapon states who are in full compliance with their NPT, nuclear non-proliferation obligations.

WHITEHOUSE: Press Briefing on NATO Defense Capabilities