Did Bhutan and Sikkim belong to China in the past?

Bhutan has been a territory of Tubo (Tibet) since the 8th century. After the Yuan Dynasty unified Tibet, Tibet became the territory of China, and it was not separated until the Qing Dynasty. However, as a vassal state of the Qing Dynasty, it was deeply influenced by Tibetan culture.

Sikkim, called Zhemengxiong in ancient times, is a state of India. Formerly known as Sikkim Kingdom,/kloc-0 was annexed by India in 975. In 2005, China officially recognized Sikkim as an Indian autonomous prefecture.

Sikkim in history was once the territory of China, and it belonged to Tibet from the 7th century to 1890 1200 years ago. Sikkim is now occupied by India. In China's ancient books, ancient Sikkim was named Dremojong. Nepalese people moved here and called it a "new place", while early Tibetan immigrants called it a trip to Xinjiang, which means rice. As early as the 7th century, Zhe Mengxiong was a part of Tibet. In the 9th century, Zhemengxiong became an independent tribe, but the monasteries in its territory still belonged to the major monasteries in Tibet.