"Evan Brennan" wrote
"D. Strang" wrote

The war could never have been won, without an invasion of
the North, and the resulting Chinese and Soviet retaliation

Hanoi emphatically rejected the idea of Soviet or Chinese troops
landing in North Vietnam -- they were suspicious of and even reluctant
to accept technicians for training and logistics, although obviously
they had to compromise.

Korea thought the same way. After they lost the war, their
vote didn't count, and the Chicoms came rolling south.