What strength would that be?
Why do you think Canada, Japan, UK, France would join a conflict in SEA? They are already struggling to supply Ukraine, and in the case of Britain, how would they even get to SEA? They no longer have bases there and their navy isn't much any more. Only the US has the naval capacity and I doubt enough spare capacity for Canadians, Brits etc.
Japan is still basically a self defense force, and too close to China to go far. Sth Korea? Unlikely as they have a nuclear armed enemy to the north
Worth remembering Canada, France and Britain did not join the war in Vietnam.