ATS generals: East vs West?

I would like your analysis on a possible scenarios and outcomes for a conventional war between the East and the West.

East: Russia, China, Iran, Syria
West: USA, Europe, Canada, Australia

How do you think such conflict would unfold? Which doctrines and weapons would be used? Where would be the main theatres and objectives? What would be the likely outcomes?

Please use realistic projections. Here is a guide on military strengths of different countries
strategypage.com...

Thank you