They also claimed that skeletons of ruling elites of ancient Silla Kingdom in S.E. Korea, according to their investigation, has paternal Mongoloid and maternal Caucasoid(Scythian is what they referred to.) They went on to speculate that the Caucasian Eastern Xiongu elites may have genetically connected to Silla elites.
You don’t have to test bones to posit ethnic mixes in Chinese history. Just look at some of the Xian warrior statues. Some of them bore Western faces when I saw the early excavations in 1983 — Turks? Indians?