During the 14th century, Poland and Lithuania fought wars against the Mongol invaders, and eventually most of Ukraine passed to the rule of Poland and Lithuania. More particularly, Galicia (Eastern Europe) became part of Poland, while Polotsk Voivodeship, Volynia, Chernihiv, and Kyiv by 1362 following Battle of Blue Waters.
Grand Duchy of Lithuania
Polish–Lithuanian Union
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History of Ukraine