Tolik, I think that it is all political. The U. S and Russian military love the idea of the cold war. The two military’s got a lot on money and were able to develop new weapons that they were able to sell to many countries. Big business. This is why I do not think there will be a nuclear war between them. The elite bankers own the military weapons developers and no cold war is not good for them.
Now Iran is a different story, they really want to destroy Israel with a nuclear bomb but if that were tried Israel has many nuclear bombs that would take Iran to the stone age.