One of the diplomatic highlights of this short-lived dynastic period was Prince Shōtoku's Japanese embassy to China led by Ono no Imoko in AD 607.
Emperor Yang thought of this Japanese behavior as 'insolent', because it opposed his Sinocentric worldview, but finally, he had to accept it and send an embassy to Japan in the next year as he had to avoid conflict with Japan to prepare for the conquest of Goguryeo.