China was part of Japan too.
Knock off your ChiCom propaganda.
Indeed, for a few years under the Shogun Hideyoshi after 1592 and forty years or so, effectively, after the Russo-Japanese war.
That doesn’t change anything about Xi’s facts. He can recite facts without reciting other facts.
I am not reciting propaganda. This is all real and can be researched and its useful as a guide as to how ALL Chinese governments (not just ChiComs) regarded Korea, and as a guide to Korean attitudes towards China (and Japan). Arm yourself with knowledge!