The study is devoted to one of the key events of the Polish-Moldavian war of 1497-1499 - the Battle of Kozmin, which took place on October 26, 1497 in the forests of Bukovina between the army of King of Poland Jan Olbracht and the military units of the Moldavian ruler Stefan the Great and his allies. The work considers the circumstances of the Polish king's campaign in Moldova with the aim of capturing it and the diplomatic accompaniment of this action, which disguised itself as an anti-Ottoman right in order to liberate the former Moldavian Black Sea port fortresses of Kilia and Belgorod.