In the introduction for the official orthography rules for Ukrainian
language (http://spelling.ulif.org.ua/peredmova.htm) there's a note
that only apostrophe does not affect order of the words when sorting.
As could be seen from the official alphabet the soft sign
(U+044C/U+042C) has its hard position and thus affects the order and
also letters "е" and "є" (CYR-IE: U+0435/U+0415 and UKR-IE:
U+0454/U+0404) have their own positions and should have separate place
when sorting.
This also corresponds to official Unicode collation chart for these
letters: http://unicode.org/charts/collation/chart_Cyrillic.html
