This is a higher probability that more human lives would end suddenly. Had the worst occurred, there will be a death of 100 million Americans and over 100 millions Russians. A nuclear winter will cover our world. Our Canada locates between these two super power nations. If these two countries open a nuclear war, we will definitely suffer.
Institutions determine policy.
We need to know who has power in a country. From that we can predict its policy. That is the key question . USA is democracy country, I think the people in USA will not allow government involve in a nuclear war. To predict the USA s reaction behavior, we can look at their Rational policy .