Analysis of information sources in references of the Wikipedia article "Tribut" in Romanian language version.
King Na was awarded the seal of the Monarch of the Kingdom of Wa during the Chinese Han Dynasty, and Queen Himiko, who had sent a tribute mission to the Wei Dynasty (third century), was followed by the five kings of Wa who also offered to the Wei. This evidence points to the fact that at this period Japan was inside the Chinese tribute system. Japanese missions to the Sui (581-604) and Tang Dynasties were recognized by the Chinese as bearers of imperial tribute;however in the middle of ninth century - the early Heian period - Japan rescinded the sending missions to the Tang Empire.Text "Radtke, Kurt Werner " ignorat (ajutor)
It was not that Japan, as China’s neighbor, had had nothing to do with or been indifferent to hierarchical international relations when seeking relationships with China or the constituents of the Chinese world order. It had sporadically paid tribute to Chinese dynasties in ancient and medieval times but had usually not been a regular vassal state of China. It had obviously been one of the countries most reluctant to participate in the Sinocentric world order. Japan did not identify itself as a vassal state of China during most of its history, no matter how China saw it.