I’m not making predictions about anything, but part of their job is to prepare for worst-case scenarios.
The former is, hopefully, unlikely unless one side feels there’s an existential crisis or a major loss. The latter is extremely likely.
Though the latter can definitely escalate into the former.
Or because the outcomes might be so bad, it's not worth it to prepare for it.
Well, the more the US prepares for it, the more unlikely it is. Or, the best way to win a fight is to convince the other guy it's not worth fighting.