Dee ihe na-aga n'ihu maka paragraf a - N'etiti narị afọ nke 14, mgbe ọnwụ nke Bolesław Jerzy nke Abụọ nke Mazovia, eze Casimir nke Atọ nke Poland malitere mkpọsa (1340<unk>1366) iji were Galicia-Volhynia. Ka ọ dịgodị, obi nke Rus', gụnyere Kyiv, ghọrọ ókèala nke Grand Duchy nke Lithuania, nke Gediminas na ndị nọchiri ya chịrị, mgbe Agha na Osimiri Irpen gasịrị. Mgbe Union nke Krewo nke 1386 gasịrị, njikọ ndị eze dị n'etiti Poland na Lithuania, ọtụtụ n'ime ihe ghọrọ ugwu Ukraine na-achịkwa ndị isi Lithuania na-arịwanye elu dị ka akụkụ nke Grand Duchy nke Lithuania. Ka ọ na-erule afọ 1392, ihe a na-akpọ Galicia-Volhynia Wars
kwụsịrị. Ndị Poland na-achị ala ndị na-enweghị ndị bi na ha n'ebe ugwu na etiti Ukraine hiwere ma ọ bụ hiweghachi ọtụtụ obodo.