No it's not . It was not in any way initiated by the west and no western country is fighting in it .
All the proxy wars previously have had much more US and western power involvement .
I'd charachterise this as a "just war" on the part of Ukraine and that is the main reason it's being supported - not the only reason , I'm sure the fact that the aggrressor is an old enemy encourages the response .
But it is interesting to see what efforts are being used - by the west , the efforts are more economic than military . It's almost carrot and stick , supply Ukraine and withold from Russia . Partly because of the nukes but I sense amongst developed countries a move away from warfare is happening and sanctions are an alternative to the brutality of conflict for them .