Chinese nowaday consider Hmong father Chiyou is one of their ancestors. Ancestor homeland of Hmong was in Chinese land.Lol when Laotian expose Vietnam's poblem with Hmong...he become suspected a chinese...Frankly only you Vietnam and Laotian know more about Hmong people than we chineses..I dont think Hmong is cosidered as ethnic minorty in China if i'm not wrong.
Actually, after defeating Hmong father, Huaxia assimilated apart of Hmong. The rest of Hmong ran toward Southern and founded nation 南詔 Nam Chieu, then Dàlǐ Dai Ly. Finally they were almost swallowed by Han peoples. The very minor rest of Hmong ran to take refuge in Viet land ( Viet peoples accepted and protected them in front of Han and Mongolian, and they also contributed much in war to fight back those invaders), then become 5th peoples of 54 peoples of Vietnam
So if Hmong people want to take back their ancestor nation, lol, ask Han peoples.