The Japanese chose as the capital of Manchukuo the industrial city of Changchun, which was renamed Hsinking. Puyi had wanted the capital to be Mukden (modern Shenyang), which had been the Qing capital before the Qing conquered China in 1644, but was overruled by his Japanese masters. Puyi hated Hsinking, which he regarded as an undistinguished industrial city that lacked the historical connections with the Qing that Mukden had. As there was no palace in Changchun, Puyi moved into what had once been the office of the Salt Tax Administration during the Russian period, and as result, the building was known as Salt Tax Palace, which is now the Museum of the Imperial Palace of the Manchu State. Puyi lived there as a virtual prisoner and could not leave without permission. Shortly after Puyi's coronation, his father arrived at the Hsinking railroad station for a visit, Prince Chun told his son that he was an idiot if he really believed that the Japanese were going to restore him to the Dragon Throne, and warned him that he was just being used. The Japanese embassy issued a note of diplomatic protest at the welcome extended to Prince Chun, stating that the Hsinking railroad station was under the Kwantung Army's control, that only Japanese soldiers were allowed there, and that they would not tolerate the Manchukuo imperial guard being used to welcome visitors at the Hsinking railroad station again.