Which legal value and which impact on political decision of nuclear powers does the Treaty on the Non-proliferation of Nuclear Weapons have? How relevant and effective is the Treaty on the prohibition of nuclear weapons? Does the changing role of the United States regarding nuclear safety, as seen in the unilateral cancelation of the Iran Treaty, impact the effectiveness of similar agreements? Write a 2500 words essay carefully considering the above problems. You must refer to real UN Treaties and Academic sources. Please reference clearly all your sources.