After the war from 1609, Ryukyu remained officially a vassal of China, not of Japan, even if it became secretly also a vassal of the Satsuma domain from Japan (not of the Japanese state).

This dual allegiance of Ryukyu, openly to China and secretly to Satsuma allowed Ryukyu to be an intermediary in some commerce between China and Japan, which officially was forbidden.

The official occupation of Ryukyu by Japan happened only in 1872, after the Meiji Restoration.

After 1609, there was no occupation of Ryukyu by Japanese. There was only a permanent threat of military intervention from Satsuma if the Ryukyuan king would have dared to act against the demands of Satsuma, which included a tribute and unfavorable commercial relationships.