However, the relationship between China and other countries can be complex. There are some territories that are claimed by China but are currently administered by other countries. The most prominent example is Taiwan, which China considers a renegade province, but which maintains its own government and is recognized by many countries as a sovereign nation.
It's important to be mindful of the differences between a country's claims and its actual control. While China considers Taiwan to be part of its territory, it does not currently control it.
If you'd like to learn more about the relationship between China and Taiwan, or about other territorial disputes, please let me know.