I dislike this kind of "laundry list" question, as well as its foundation in a questionable claim. Nevertheless, it is easily answered.
Zhou Enlai's speech at the Afro-Asian Conference in Bandung in 1955 offers three clues to annexations that the PRC would refuse to condemn, or even endorse,
One should say that now the common desire of the awakened countries and peoples of Asia and Africa is to oppose racial discrimination and to demand for fundamental human rights, to oppose colonialism and to demand national independence, to firmly defend their own territorial integrity and sovereignty. The struggle of the Egyptian people for the restoration of their sovereignty over the Suez Canal Zone, the struggle of Iranian people for the restoration of sovereignty over their petroleum resources, and the demand for the restoration of territorial rights of India over Goa and of Indonesia over West Irian, have all won symphathy from many countries in Asia and Africa. China’s will to liberate her own territory Taiwan has likewise won the support of all righteous people in the Asian-African region. This proves that the peoples of our Asian and African countries understand each other and have sympathy and concern for one another.
Of course, in 1955, none of these annexations had actually taken place but,
- Egypt annexed the Suez Canal Zone in 1956, with China's support. This was violently resisted by the British, French and Israeli governments.
- Indonesia eventually annexed West Irian in 1962, overcoming opposition from the Netherlands and Australia, in particular. I can't find any evidence that China opposed this, and it seems likely that they supported it.
- India annexed Goa in 1961, despite much opposition from several Western states (and Pakistan). The Chinese government essentially supported this, although it appears some state media were critical of Nehru's motives.
A more recent example is the situation in Western Sahara, which China doesn't appear to have expressed much of an official view on. I assume its possible to find even more cases.