go to settings, write "language" in the search bar, click at the one that says "change language for the keyboard" or something like that,then click at "add another language" and search for ukrainian or whatever language you wanna have.

I'm not really sure cause my brother did it but i do know tht you go to settings and then you do something but after your done you just press and hold the space bar i hope that this answers your question. #see you later!