However, there was still nuclear research after the Cold War. Without a doubt, all this advanced science and technology and modern weapons played a vital role in the Cold War, and it was precisely because technology and weapons prevented the Cold War from becoming a hot war and prevented the outbreak of the Third War World. Both of these two countries were superpowers, they were almost equally equal, in terms of the technology they developed and the weapons they possessed. They also knew that they were not completely sure of defeating the other side if they fought, and that is why the war was called the “Cold War”. Furthermore, the leaders of the two countries knew very clearly that modern weapons, including nuclear weapons, were so destructive that they could destroy not only a country, but also the world. It would be a disaster for the entire human being. I think it was fortunate that, in that serious situation, the leaders of both countries kept a "cool" mind and did not launch the initiative