[cryptonector]

I think the issue is that one side having an overwhelming non-nuclear, conventional advantage might push the other to a nuclear response in the event of a catastrophic loss in a conventional conflict. Imagine Chine tries to invade Taiwan and they are defeated so badly that the CCP might fall -- then perhaps a nuclear response becomes more likely.

However, I think this is not the case. In the end no one wants to reduce the world to ashes over losing power. But... well, I suppose there are people crazy enough to want that.