These treaties were produced to eliminate testing of weapons of mass destruction as a primary source of global instability and danger. ... The objective of this treaty is to prevent the spread of nuclear weapons and weapons technology, to promote co-operation in the peaceful uses of nuclear energy, to further the goal of achieving nuclear disarmament, reduce the risk of nuclear war and promote the security of all nations. ...
Their former colleague, Lise Meitner, a physicist working in Sweden because of Hitler's oppression of the Jews, and her nephew, Otto Frisch, concluded that the nucleus of uranium had apparently fissioned with a release of about 200 MeV of energy. ... After the end of World War II the Soviet Union developed nuclear weapons and both the U.S. and the Soviet Union identified ways to increase the explosive yield of nuclear weapons by using the fission core (or primary) as a thermal source that stimulated fusion of hydrogen isotopes that would form a secondary yield of the nuclear weapon. ...