In 1970 the Nuclear Nonproliferation Treaty took effect; it was later ratified by some 140 nations. Yet, potential nuclear powers, such as Argentina, Brazil, India, and Israel, have refused to sign even to this day.
फिर भी, संभाव्य परमाणु शक्‍तियाँ जैसे अर्जेंटाइना, इज़राइल, ब्राज़ील, और भारत ने आज तक इस पर दस्तख़त करने से इनकार किया है ।