Looking at the pure facts of the invasion, it’s indefensible and Putin is simply a warmonger. Also from a leftist perspective, this is just another criminal war between capitalists, which will hurt innocent working class people

I think you have the right idea at leaving it here. I think there is something primal/natural about wanting to have a "side" in all this, probably empathetic brain wiring wanting to "participate", but you correctly identify it as something that you shouldn't indulge.