The Soviet Union would "win" in the sense that it would still exist, unlike China- much like the US in a Cuban-Missile-Crisis-goes-hot scenario.
I can't tell if you're calling comparing the US in a Cuban-Missile-Crisis-gone-wrong to the Soviets or China.
For reference the Chinese had about 150-160 warheads in 1984 (according to a US intelligence estimate) so they probably had less in 1969. The USSR meanwhile had about 10,000 nuclear weapons.The Soviet Union. They had a massive advantage over China in terms of their nuclear arsenal, just like America held a massive advantage over the Soviets themselves in 1962.
The Soviet Union. They had a massive advantage over China in terms of their nuclear arsenal, just like America held a massive advantage over the Soviets themselves in 1962.
The Soviet Union would win in the conventional sense, but America really wins because they weren't involved.
And besides, as they say...
Nuclear War is like tic tac toe...
Nobody wins
That said, neither side was willing to lob nukes
It would not be China. Combine Mao's nonsense going on at this point with a likely nuclear confrontation and probably, a lack of decent Soviet help, and China gets fucked up.