Where does “Руська земля” come from?

Руська земля (Ukrainian) comes from Old East Slavic русьскаꙗ землꙗ.

Ancestry of “Руська земля”, step by step

StepLanguageWordMeaning
1Old East Slavicрусьскаꙗ землꙗ
Every word from Old East Slavic русьскаꙗ землꙗ