If you include the global south (which obviously you should), most of the world sides with Russia. I'd agree with you that unless things really take a turn towards deescalation, which is laughably unlikely, history will look back at this time as WWIII having already begun. But it's a lot more complicated than just a proxy war against Russia. It's a proxy war the Western Imperialists via NATO but under the hegemonic control of the US in particular, is waging against the rising challengers of that hegemony. And primary among those is China, which is why we have the constant and unrelenting sinophobia and anti-China propaganda. It's just that Russia has just been the first and boldest to actually use military force against the encroachment of western imperialist ambitions, but Iran is being forced into taking action now too. Also Hezbollah and Anserallah of course, but I mean among those that are fully recognized as state actors.

But no, if this does shape up to truly be WWIII, then the line is not between Russia and the world. The lines are between Western Imperialists and Multipolarists.

World War III: 2

World War IV