The regions should have different funding levels based on their size, and isolation from other regions. This would make bases in locations other than the middle east viable.
Not sure on exact numbers, but the rankings should go something like this, from greatest amount of funding to least:
-North America
-Russia
-Indochina
-Australasia
-Europe
-South America
-South Africa
-Central America
-North Africa
-Middle East
Just a rough list FYI, some things may need to be moved around.