Type in Ukrainian using your keyboard then copy/paste into email or document.
You can spell check it online.
Type normally - with your regular physical keyboard, using either Standard or Phonetic (homophonic) layout (when À-À, Á-B, Ä-D, Ô-F, Ê-K,...)
In addition, mouse based input also works and there upper-case symbols are typed by holding Shift button on the physical keyboard while clicking on symbol.