The main participants in the Vietnam War obviously were South Vietnam and the United States, against North Vietnam and the Viet Cong with extensive aid and covert military operations done by the Soviet Union. Additional belligerents on the anti-communist side include South Korea, Laos, the Khmer Republic, Australia and New Zealand, while on the pro-communist side there was China, Pathet Lao, Khmer Rouge, GRUNK and North Korea. But I wonder, could more nations have feasible participated in the war, and would this change any overall outcomes?
In particular, I can see the members of NATO like the United Kingdom, France and West Germany sending troops in support of the US (in particular, remember that the French Indochina War had begun this whole debacle to begin with). It probably wouldn't be nearly as many as what the US had invested and likely all would be volunteers, but it may be good for the extra support and not having to exhaust their own resources as much (which may be a good PR move back home). For the pro-communists, I can see the Warsaw Pact nations taking a more active role in assisting the NVA, and maybe taking part in joint military operations (most likely covert, and when possible, avoiding direct battle with America itself and focusing elsewhere). I could also see Cuba sending troops here, like they would in Angola.
But that's just really off the top of my head, as someone who is admittedly not an expert of geopolitics of the time. Was there any likelihood of additional belligerents in this war?
In particular, I can see the members of NATO like the United Kingdom, France and West Germany sending troops in support of the US (in particular, remember that the French Indochina War had begun this whole debacle to begin with). It probably wouldn't be nearly as many as what the US had invested and likely all would be volunteers, but it may be good for the extra support and not having to exhaust their own resources as much (which may be a good PR move back home). For the pro-communists, I can see the Warsaw Pact nations taking a more active role in assisting the NVA, and maybe taking part in joint military operations (most likely covert, and when possible, avoiding direct battle with America itself and focusing elsewhere). I could also see Cuba sending troops here, like they would in Angola.
But that's just really off the top of my head, as someone who is admittedly not an expert of geopolitics of the time. Was there any likelihood of additional belligerents in this war?