Russian and India are on the same side. I could see all three putting aside their differences to win the great war of East vs West.A fly-in-the-ointment for China is India. According to an article I read in the printed version of The Epoch Times India and China have a big beef over territory. If China starts after Taiwan or the Philippines India might think it's a good time to settle a score. China could fine itself in a two front war.
Russia is not close to India so Russia would have to cross a lot of countries to get to India. Also Russia has it's hands full with Ukraine and may not be in a position to help China and of course I don't think Iran would be of much help to China either. Over land I ran would have to take on Pakistan on the way to India. And by sea Iran doesn't have much of a navy to take on India. And of course the US, NATO, and SEATO would be involved on the side of India.
This could get real interesting real fast seeing as how Russia, China, Pakistan, India, US, etc. are all nuclear countries.