The 3 main regions of the Eastern Coalition were Russia, China and the Tigris Confederacy.
The following nationalities were reprasented as pilots in the Western Alliance in StarLancer:
UK
Canada
US
Japan
Germany
Itay
France
Australia
South Africa
The French and Italian fleets surrendered at the start of the Solar War, probably due to them being trapped near the systems core planets. Another possibility is that they were the fleets at Fort Kennedy, and bore the brunt of the Coalition's surprise attack on the base (this is backed up to an extent by the fact that the main Alliance fighter at Fort kennedy was the French Mirage IV). French pilots and Italian squadrons were mentioned in the game (the 45th had a French and Italian pilots, and the Italian Hornets were wiped out by the Zakov and it's fighter support). However, this means nothing when it comes to the civilian populations, these could have crewed sleeper ships.
As for wether France and Itay's forces were depleted prior to the Solar War, the pre-war history of the Alliance/Coalition seems to have been primarily a case of small border/colonial conflicts, with the sole exception of the Europa Conflict about a decade before the Fort Kennedy Massacre that trigger the Solar War. Ad far as I can tell, the Europa Conflict was a relativly short-lived conflict, and it was unlikly that exteremily heavy losses would have occured, and even if they did, then they would have been adequit time to rebuild before the Solar war started.
To the best of my knowledge the Alliance didn't have any Spanish pilots, squadrons or ships that were mentioned in StarLancer, they may well have been some, but they weren't mentioned in the game at all.
There is a very good possibility that African/South Asian sleeper ships made up the Exodus Fleet, as I can't believe that all those countries could have formed part of the Coalition. But then again, perhaps they did? It would explain the odds tipping in the Coalition's favout in the Solar War.
TjM - every one of the four major Alliance nations in SL (UK, US, Germany, Japan) had their "own" ships ie. ships that were primarily built by the nation:
France: Mirage IV
UK: Crusader, Tempest
Japan: Naginata, Shround, Phoenix
Germany: Grendel, Wolverine
US: Predator, Coyote, Patriot, Reaper
And do you know whats scary? All that comes from memory...