: That is definitely correct. What I'm not sure about is China and Russia,
: though.
: The Koslovics were communist, so that would mean that Communist China either
: fought against them as part of the UN, stayed neutral due to their
: communist sympathies, or left the UN outright and supported the Koslovics.
: Though the latter would have added the additional threat of a China-UN
: ground war on Earth, with possibly nuclear implications, so I don't think
: that's plausible.

: As for Russia, I have some doubts that they'd support a US-led UNSC, but I
: don't think they'd have any choice.

: Or perhaps China and Russia in 2160 are no longer anti-US. Perhaps China
: isn't even Communist anymore. We can only speculate since we know
: literally almost nothing about this period.

Returning with an answer to my own question.

Since the UEG was formed so easily in 2170 after the defeat of the rebels, it's rational to assume that there wasn't any real opposition from the traditionally anti-Western countries like Russia and China. That means China is no longer Communist in 2160, but pro-Western, which was bound to happen anyway. Russia will likewise be pro-Western.

However, that raises the following question: if there is no longer a powerful communist country on Earth by 2160, where do the communist Koslovics get their support from? Did they simply form a more-or-less guerrilla movement with support from workers from the colonies? If that's the case... no wonder they got their asses kicked so easily.