Vietnam war - soviet/chinese direct intervention

So let's suppose the korean war scenario sort-of repeats itself in Vietnam. Let's say the americans started their bombing campaign against North Vietnam in 1965, and the soviets decide they can't let the vietnamese face the americans on their own, so they send a few regiments of fighters (MiG-21s), a division or two of air defence misiles (S-75s and maybe a few S-125s) etc. All "volunteers" mind you operating under NV colours, sort of like the later deployment in ME in 1969-70.

We of course have the beggining of the sino-soviet split, but for want of maintaining their influence in Vietnam, and of course to keep the americans out of their back yard the chinese somewhat leave behind the political conflict with USSR and they too send a few regiments of fighters (J-6s maybe), air defence troops, promise substantial more help to the north vietnamese army etc. Let's say they are loath to commit ground troops though (at least as long as North Vietnam is not invaded by the americans).

So how does the Vietnam war goes in this TL? What will the americans do, given all the happenings in OTL which caused them not even being able to "save" South Vietnam, let alone invade the North? Do they pull out much sooner, considering much increased losses compared to historical? Or do they commit more troops and aircraft? Say they do pull out much sooner, Vietnam is reunited and the soviets and chinese are encouraged by the result of their intervention and and decide to pull the same trick in Korea and even Taiwan (say late sixties/ early seventies)? In a best case scenario for USSR and China, could they achieve the reunification of Korea (under communist rule of course) and could China even gain Taiwan without WW3 errupting, through among other ways negotiations with the americans about adjusting their respective spheres of influence? Could the americans realistically give in?
 
Nope.
Neither the USSR or China would go past 'Volunteers' with newish, but not front line gear.

Otherwise WWIII gets too easy.

That's why all were willing to accept proxy wars
 
So let's suppose the korean war scenario sort-of repeats itself in Vietnam. Let's say the americans started their bombing campaign against North Vietnam in 1965, and the soviets decide they can't let the vietnamese face the americans on their own, so they send a few regiments of fighters (MiG-21s), a division or two of air defence misiles (S-75s and maybe a few S-125s) etc. All "volunteers" mind you operating under NV colours, sort of like the later deployment in ME in 1969-70.

We of course have the beggining of the sino-soviet split, but for want of maintaining their influence in Vietnam, and of course to keep the americans out of their back yard the chinese somewhat leave behind the political conflict with USSR and they too send a few regiments of fighters (J-6s maybe), air defence troops, promise substantial more help to the north vietnamese army etc. Let's say they are loath to commit ground troops though (at least as long as North Vietnam is not invaded by the americans).

So how does the Vietnam war goes in this TL? What will the americans do, given all the happenings in OTL which caused them not even being able to "save" South Vietnam, let alone invade the North? Do they pull out much sooner, considering much increased losses compared to historical? Or do they commit more troops and aircraft? Say they do pull out much sooner, Vietnam is reunited and the soviets and chinese are encouraged by the result of their intervention and and decide to pull the same trick in Korea and even Taiwan (say late sixties/ early seventies)? In a best case scenario for USSR and China, could they achieve the reunification of Korea (under communist rule of course) and could China even gain Taiwan without WW3 errupting, through among other ways negotiations with the americans about adjusting their respective spheres of influence? Could the americans realistically give in?

Maybe East-German ?
 
Just seems way too much risk for relatively little gain to me. Sorry Comrade General, but you have been reassigned to the Siberian Civil Defense Network.
 
Nope.
Neither the USSR or China would go past 'Volunteers' with newish, but not front line gear.

Otherwise WWIII gets too easy.

That's why all were willing to accept proxy wars
Not sure if i understand you point. I was reasoning that, as in OTL the americans imposed at various times bombing limitations against targets there was a soviet presence around for fear of killing soviet troops and escalating things further, in this ATL we already have soviet/chinese fighters and air defence troops, so it's possible the americans might stop bombing targets in the NV altogether, and only concentrating in stemming any infiltrations in the SV, on the other hand if they still continue the raids against targets in NV they will be faced by the full force of about 150 MiGs and J-6s, much more formidable than the VPAF even if VPAF fought very honourably against an opponent much bigger and more technologically advanced, plus even more formidable AD.

It would be most interesting to have seen how things would have gone in a fight between the american air power and soviet/chinese fighters (mainly MiG-21PFM/S and J-6, but possibly other types/ subtypes) and AD supplementing VPAF and VPAD, thought likely the scenario in which the soviets/chinese defend the North while the americans limit themselves to bombing any infiltration in the SV is more probable, but fewer bombing attacks against NV means less damage to it's military and civilian installations, which means more troops and resources commited to try and advance in SV, which probably means more US losses.
 
Korea and "volunteers" were the reasons why everybody took a step back to prevent USS and Soviet troops from actually engaging each other in at least semi-official capacity. so while Chinese and Soviets might increase number of advisors they will be spread out and easier to hide and for Us to pretend it didn't se them.
 
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