Last week, the head of the China Federation of Demanding Compensation From Japan, Tong Zeng, told the Chinese state news media that Japan should return the stele. In an interview in Beijing, Mr. Tong insisted that his organization was not affiliated with the Chinese government or acting on its behalf, although it seems clear that if the authorities did not approve his request, it could not proceed. In contrast to some of the other disputes with Japan — including China's claims to Japanese-administered islands in the East China Sea and its declaration of an air defense zone over those waters, or visits by the Japanese prime minister to the Yasukuni Shrine, which includes war criminals among Japan's honored war dead — the federation's request for the stele is polite in tone, though still politically charged. before Mr. Tong's group had made a public issue of the stele, historians from China and Japan had puzzled over its significance. An inscription with 29 Chinese characters mentions a Tang emissary, Cui Xin, who gave instructions for two wells to be dug. A Chinese historian who has devoted 20 years to the study of the stele, Wang Renfu, says the stele is important because it shows that Cui Xin had gone to the region around Lushun, then known as Bohai (and Balhae in Korean), to establish China's sovereignty over the people there.