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The Mongol invasions of Japan ( 元寇 , Genkō ? ) of 1274 and 1281 were major military efforts undertaken by Kublai Khan to conquer the Japanese islands after the submission of Goryeo ( Korea ) to vassaldom. Despite their ultimate failure, the invasion attempts are of macrohistorical importance because they set a limit on Mongol expansion and rank as nation-defining events in Japanese history .