I like IL’s suggestion of light yellow for the Spanish.
I was just scrolling down the thread to suggest turquoise for the Turkish (I had suggested for the Australians in the past before grey became the established colour for them) when I saw that Redking beat me to it. :-D Anyway, I do think it would be a good idea, if not for the Turkish then at least for another nation.
In relation to Red, I think I should point out that the FMG Soviet pieces will match the FMG Soviet dice, which are solid red and not reddish-brown.
While we are discussing colours, maybe we could suggest a list of possible remaining colours for HBG pieces, if more are needed (some of these have been suggested here previously):
Dark Grey-Green
Orange-Red (different enough to distinguish from FMG Soviet Red and OOB/FMG Japanese Orange, as necessary)
Yellow-Orange
Turquoise
Dark Navy Blue
Pale Grey-Blue
Pale Orange
Dark Yellow (but as dull as possible)
I would prefer to avoid bright and/or neon colours, together with pink and purple (although a dark or grey-ish purple might work if one was desperate for a new colour).