Rubuta ci gaba don wannan sakin layi - A tsakiyar karni na 14, bayan mutuwar Bolesław Jerzy II na Mazovia, sarki Casimir III na Poland ya fara kamfen (1340<unk>1366) don ɗaukar Galicia-Volhynia. A halin yanzu, tsakiyar Rus', gami da Kyiv, ya zama yankin Grand Duchy na Lithuania, wanda Gediminas da magabatansa suka mallaka, bayan Yaƙin Kogin Irpen. Bayan 1386 Union of Krewo, ƙungiyar daular tsakanin Poland da Lithuania, yawancin abin da ya zama arewacin Ukraine ya mallaki masarautan Lithuania na gida da ke ƙara zama Slavic a matsayin wani ɓangare na Grand Duchy na Lithuania. A shekara ta 1392 da ake kira Galicia-Volhynia Wars
ya ƙare. 'Yan mulkin mallaka na Poland na ƙasashen da ba su da yawa a arewa da tsakiyar Ukraine sun kafa ko sake kafa garuruwa da yawa.