The Republic of China has claimed South Tibet, including the Arunachal Pradesh area, as its territory, at least in the following senses or contexts:
- The whole reason of the dispute was that the ROC representative had refused to recognize the concession of Tibetan territories made by Tibet to British India, since China considered Tibet to be under Chinese rule (effective or not) and did not recognize the power of Tibetan government to conduct foreign affairs without consent of the central Chinese government (be it Qing, ROC or PRC). The Chinese position is that the border line around the region has not been resolved by bilateral accords and is an unsettled question.
- The Government of the ROC had published a map over its entire territory until 1998 and included the South Tibet region (1925, 1979, 1998). For context, in 1998, Taiwan had already held its first universal elections on local and national level that were considered open and fair enough.
- The Yearbook of the Republic of China published by the ROC government included a section on Mainland territories claimed by the ROC until 2005. It (the 2005 edition) claimed the border of ROC's mainland territories is roughly "parallel to the lower Yarlung Tsangpo stream, and 60 km away from it" For context, the first non-KMT president was elected in 2000.
Since 2005, the government has de-emphasized its claims outside the so called Free Areas and stopped actively publishing official maps over the entire territory (全图). The name "Free areas of the Republic of China" itself implies the existence of "unfree" areas.
In any case, the ROC currently has no interest and no ability to assert claims over disputed areas in Mainland. But it has not formally renounced its claims, other than the re-recognition of an independent Mongolia.
The current ROC regime nonethless relies on historical claims (inherited also by the PRC regime) from time to time in the context of maritime disputes in East China and South China Seas. The ROC actively pursues its claims in these disputes against countries other than the PRC (and vice versa).