Soviet fission bomb

The Soviet Union successfully detonated its first nuclear fission bomb, ending American monopoly on atomic weapons. This event marked the beginning of nuclear arms race with two superpowers.
 Igor Vasilyevich Kurchatov Soviet Union 1949 Soviet fission bomb

The Soviet Union successfully detonated its first nuclear fission bomb, ending American monopoly on atomic weapons. This event marked the beginning of nuclear arms race with two superpowers.