I don't know if I put this in here earlier, but I have a particularly dark headcanon for Trek.
We don't see alot of Asian people in Star Trek because... there aren't all that many Asian people. The Eugenics Wars had largely been fought in Asia, and then the brunt of the nuclear exchange of WW3 was also in Asia, as well as the worst and longest parts of the "Post-Atomic Horror".
Asia was just absolutely ravaged for like, a century. While western nations were sending out warp ships to colonize new stars, Asian countries were living through a Mad Max apocalypse world, probably up through the early 22nd century.
Also... while not actually my headcanon yet, more of a "that's a neat idea", the "Eastern Coalition" wasn't a Pacific power... it was a fractured part of the US. Pike claims the Second American Civil War rolled into the Eugenics Wars, which rolled into WW3. Perhaps the ECON was a faction borne of the Second Civil War and the US had not reunited yet as of 2063. Colonel Green may have been a prominent member of the ECON.