Is ancient Ryukyu the territory of ancient China?

The ancient Ryukyu was not the territory of China, but it belonged to China for a long time, with the same status as Korea and Viet Nam.

From 1372, Ryukyu became a fan of the Ming Dynasty.

Starting from 1383, the king of Ryukyu Kingdom must accept the knighthood of China government when he succeeds to the throne.

1654, the emperor shunzhi of the Qing Dynasty made Ryukyu King the King of Quality, and Ryukyu became a vassal of the Qing Dynasty.

1879, Japan destroyed Ryukyu and established Ryukyu Okinawa Prefecture.

Therefore, Ryukyu was a vassal state of China for most of the time. During the Ming and Qing Dynasties, a large number of southerners immigrated to Ryukyu, which was greatly influenced by China culture, and it still seems to be out of tune with the Japanese. After the victory of World War II, China had many chances to recover Ryukyu, but failed to do so for various reasons.