During the Cold War, while relying upon a balance of terror to keep the peace, the superpowers agreed to permit the development of nuclear know - how in pursuit of peaceful ends but to restrict its use in making nuclear weapons.
वर्ष १९७० में न्युक्लियर नॉन - प्रोलिफिरेशन ट्रीटी लागू हुई; बाद में १४० राष्ट्रों ने इसका समर्थन किया ।