Not as long as global economic integration is still functioning. World War in this age would cripple the entire G20.
Not everyone chooses sides (even in a "World War")
Mexico's got enough of it's own internal problems to really be bothered choosing a side.
The EU literally can't take a side, representing all of Europe (although it probably would side with us if it could)
There's really no valid reason for Indonesia to be involved at all (unless China the war)
Same with Saudi Arabia, who still has this little thing called Islamic Extremism to deal with at home.
Even if we went to war with Russia, its not guaranteed that it would escalate into a world war.
Realistically, the only way we could go to war with Russia would be under an international coalition involving virtually every other country in the world minus Russia.
Um, I'm pretty certain that China at the minimum would back Russia up (and maybe North Korea , their leadership seems to love chaos)
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