About when did a US/CCCP war become suicidal?

"james_anatidae" wrote in message ...
I was wondering at about what point that the United States going to war with
the Soviet Union become an almost certain act of mutual destruction. I'm
assuming it sometime in 1960's or 70's, since what I've seen of the Soviet
nuclear capability before that point doesn't seem to be all that
threatening. It looks like they would have been really bad for us
Americans, but not unsurvivable.

I think October 23, 1961 is a watershed date. That is the day that
the Soviet Union exploded the Tsar Bomba, the largest bomb ever
exploded.

Note that the yield of this bomb did not represent the technical limit
on the yield of a hydrogen bomb. It is my understanding that there is
no known limit. Instead, the Tsar Bomba represents a kind of
political limit in a historical context. After the Tsar Bomba, the
politicians on both side put on the brakes.