Maybe this will help: Is China contemplating a surprise nuclear attack against the US?
PS: The Soviets seriously contemplated the same thing in the late 60s-early 70s, when they felt they had achieved strategic superiority and thought it might be a good idea to… finalize things, according to documents that became available in the 90s. Thankfully, someone must have said something reasonable, such as “ARE YOU CRAZY??” One hopes someone would proffer the same thoughtful question in Beijing.
(Crossposted at Sister Toldjah)