Kublai Khan of the Mongol Empire turned his attention towards Japan starting in 1268, exerting a new external pressure on Japan with which it had no experience. Kublai Khan first sent an envoy to Japan to make the Shogunate acknowledge Khan's suzerainty. The Kamakura shogunate refused. Mongolia repeatedly sent envoys thereafter, each time urging the Shogunate to accept their proposal, but to no avail.