You can make this change via the following instructions:
Code:
Open nation.dat in XVI32.
CTRL+F for Ukraine.
CTRL+G and in the Go to panel, select hexadecimal and $73. In the Go mode panel, select relative down.
This will bring you to the offset of Ukraine's first language. You should land on a square that shows the value 15h in the left panel of XVI32.
This offset is the value of the Russian language.
Change 15 to 3F (Russain --> Ukrainian).
In the next square to the right, change 00 to 15 (none --> Russian).