After failing in the two Mongol attempts to invade Japan, Kublai Khan, the founder of Yuan, sent a mission to Japan to make Japan its tributary nation through negotiations, although still watching for a chance to invade Japan again.
二度の日本遠征（元寇）に失敗した元の世祖クビライは再遠征の機会をうかがうと共に、交渉によって平和裏に日本を属国とするべく使者を派遣した。